Also CCNP and CCIE ENCOR 350-401 Official Cert Guide 2nd Edition (page 96) says that there are 4 roles in VTP, not 3 - Server, Client, Transparent and Off. I suppose it better to be aware of this being preparing for exam.
I believe others could not move on due to unknown reasons and others they might have struggled to understand important concept which is vital in moving on. I.e I struggled for days with subnetting but I kept on rewatching until I understood
@@masanashaunshipalana7622 ChatGPT helps a lot and made me ACE all those Labs so far. I'm on day 2 of my studies and am reaching this video. Helps that I'm on a break from work. Whenever I struggle on something, ChatGPT explains like im an idiot and makes anything easy to understand.
I just want to say thanks for these videos. I've tried out multiple courses over the last few weeks, and have constantly felt overwhelmed when watching them. It made me feel like I wasn't up to the task of learning this stuff, and I nearly gave up all together. Your videos were the first time I ever felt capable of understanding the subject matter. I think most courses simply underestimate the importance of repetition and association. They mostly discuss a subject once, regardless of complexity, and then simply assume you understand everything and move on. The Anki cards you added are really a great resource in that regard. I started out with just the cards you made, but added tons of my own to help me study. There's just so much to remember, but your approach makes it feel managable. So, keep up the good work. Eventhough this course isn't finished yet, your videos are definately what made me decide to get my CCNA.
Thank you so much for this comment, really made my day. I do agree with you about some courses, not just for CCNA but for anything. There are plenty of CCNA instructors with more experience than me (people who have had their CCNA for decades, while I've had my CCNA for 2 and CCNP for 1.5), but I think the fact that I'm still 'fresh' helps me understand what its like to study the material from zero. Hopefully that helps make my course understandable! Good on you for making your own flashcards too, I highly recommend it. Make your own, delete any of mine that don't work for you, or edit and reword them, etc.
Coming into this with zero experience, I have to say that your breakdown of topics is concise, and your incorporation of ANKI is fantastic. I think it's sorely needed throughout various learning tools. I think I'll be pausing progress here and review a while because I've been in the weeds since day 17. Thank you Jeremy!
Today is the 10th day of my study. When I felt perplexed in your videos because of my weak foundation, I opened the official guide. As I looked at the official explanation, I found that it is not as concise as you. The official guide made me more nonplussed. What’s more, I used the “search” function to search keywords, I got too many results. I didn’t know which was the best search result to learn from. Because when I looked at detail, I found more terminology I’ve never seen. Finally I choose to watch your video again.
Thanks very much Jeremy, you're still empowering us with some great skills. I'm looking forward to learn more and practice as much as I can to pass the new CCNA exam.
Jeremy, I cannot thank you enough for these videos. I’m using Wendell Odam’s official cert book and netsim for my labs and router sim. Your videos really tie everything together for me. I appreciate the work you put into these!
I have spent almost 2 weeks on this topic and now it starts to kick in, but it is still challenging. I am moving on but will be back on the Dot 1Q, VTP etc... topics.
I just discovered this playlist about a week ago and have been going ham ever since, but didn't know you were still releasing these lessons. When are you planning to have all the lessons done? Just curious because I was planning on taking the CCNA shortly after finishing your lessons.
When I saw VTP/DTP for the first time, I didn't understand very well and it was so difficult to remember, but now if with your explanation it was very easy to understand. Thank you so much!!!
I have a doubt.. if anyone could answer..Thanks in advance.. 6:47 A switchport in dynamic desirable mode will actively try to fom a trunk with other cisco switches. It will form a trunk if connected to another switchport in following modes: Switchport mode trunk and switchport mode dynamic desirable. 29:12 In quiz question 1: How is trunk formed between two switches? My understanding is: SW1 interface is operating in access port mode (As per question) and older spare switch will default to switchport mode dynamic desirable. So in this scenario, trunk will not form and both will operate as access ports. Am I missing something here?
I have been following this course for a while now, its definitely the best CCNA course that I ever took. Just curious, will you also cover the network automation and programming in this course? Btw I can't imagine the effort you are putting on making such a course possible for free. When watching these videos I feel confident that after the video I'll have a good understanding of the topic. You are the best teacher. Respect sir!
Thank you for your comment! I will cover all of the CCNA exam topics, but automation will come last (gotta learn about networks before trying to automate them).
Right away you can tell that VTP is not very secure and that someone could potentially spoof as VTP server with a high revision number basically taking control and wrecking havoc.
@12:30 "The DTP frames that DTP uses to negotiate are sent in VLAN 1 WHEN using ISL". But aren't we using DTP frames to negotiate between ISL or dot1q??
Good question! When the first DTP frames are sent (before the switches have agreed upon access vs trunk and ISL vs dot1q), both interfaces are access ports. So, there is no VLAN tag (no ISL or dot1q tag). If they then agree that they will form a trunk connection, if they decide to use dot1q the frames are sent untagged in the default VLAN (which is 1), but if they decide to use ISL the frames will be tagged in VLAN 1.
Two things you need to know to solve this question: 1. New Cisco switches default to 'switchport mode dynamic desirable' 2. Old Cisco switches defaulted to 'switchport mode dynamic auto' The question says the connected interfaces are OPERATING as access ports. It doesn't say they are CONFIGURED as access ports. So, when you remove one of the new switches and connect an old switch, a trunk is formed. Why is that? It's because the NEW switch had the default 'switchport mode dynamic auto' configuration, but the OLD switch which you just connected has the default 'switchport mode dynamic desirable' configuration. Auto + Desirable = a trunk is formed. Before, when the two new switches were connected, both had the default 'switchport mode dynamic auto' configuration. Auto + Auto will operate as an access port.
If anyone is at this point in the course, comment under this comment if you'd like to be a study partner! It gets a little lonely studying alone and would like someone to share what I've learned with and vice versa so we both understand the topic. We will obviously use this same material :)
Hey Jeremy, I am loving the content. I have a question concerning question 1. If the old switch is in "dynamic desirable" mode by default and SW1 interface is in "access" mode. According to the table shown earlier at 9:58 , wouldn't it become an access port too?
In that case it would become an access port. However the question states that a trunk was formed, so we know that SW1's interface wasn't configured in access mode.
Can someone clarify this for me: at @17:01 he says "Will advertise their VLAN database, and forward VTP advertisement to other clients over their trunk port". I understand the second part: they forward the advertisement they receive from the server, buy I don't get the first part: why would a client advertise their database?
this was the longest video i have watched its been a week and just finished it finally. I get really lazy to watch this since DTP and VTP was mentioned to not be usually used nowadays so my brain goes don't learn it but need to finish the video for the sequence of the course and to say that i finished it.
I don't mean to come across as overly critical, but from my understanding, changing a switch's VTP domain name to any other name, whether it's an unused one or not, will reset the revision number to 0, and thanks for your amazing courses!
I am sorry, at 21:58 you say "ALL HOSTS will lose connectivity". I just want to clarify for myself why the hosts will lose connectivity if we do not configure VLANs on the hosts / PCs? Since after synchronization all the data in all switches will be the same, shouldn't the PCs/hosts work? I mean at what point, between what points will there be a mismatch? Maybe between Switch1, which is a server and Router, because In case with Switch Layer 2 traffic goes through Router, which is understood, but if SW layer 3 forward traffic directly to other networks? If this is Native Vlan, then the hosts should not lose connections in this case, in all other cases the hosts will lose their connection, did I understand correctly?
in quiz 1 A) can also be true. If SW 1 is in dynamic mode, it would cause mode trunk comunications between SW1 and old one. Broken SW2 could have been set to access and communication could also be Access since SW 1 is in dynamic mode. correct me if im wrong pls... anyway - thanks for your effort, I'm spreading this course as much as possible to all of my IT friends! big up
isnt quiz 1 supposed to form an access port? since SW1 and SW2 were operating as access ports and we switched out SW2 for a switch using dynamic desirable. my only guess is that SW1 is set to dynamic desirable or auto.
Nice, it really is a fantastic product for preparing for your CCNA! Definitely go through them to fill in any weak points before taking the real thing.
About VTP Revisions problem. It seems easy to fix no? When the old switch is added why not reset the revisions as its being added to a different network? Or there could be other solutions put in place. Seems odd to just not use a functionality(as theres a reason it was added in the first place) because of a fixable problem.
Could you please give examples to when is it better to configure a switch port as dynamic desirable and when to configure it as dynamic auto? Also in VTP, if I connect a new switch to the network, it will not update its database unless a new a modification is done, is there a way to update its database manually?
The only best practice regarding DTP is to disable it. Never use DTP in a real network! To force the VTP server(s) to send out an update (and make the new switch sync), create a new VLAN on the server and then delete it. It will send out an update each time, and the new switch will sync.
@@JeremysITLab Thanks a lot Jeremy, I know I ask a lot of questions, but that's because I like your course and I would really like to get the most out of it.
At 13:15, so if I configure both switches with either dynamic desirable/dynamic auto/trunk mode, but after that make sure to configure "switchport nonegotiate", will the nonegotiate override? Or will the switches still send DTP frames?
@@JeremysITLab haha silly me i missed your lab. the very first task you put on your lab answers my question. again awesome lab! thanks so much for all your efforts into your course! it just gets better and better!
Hey jeremy ur videos are pure pleasure to watch i till now couldnt find more easy explicit contznt as yours out there just one question i couldnt wrap my mind around the meaning of dot1q frameq are sent in native vlan and isl frames in vlan1?? Can u plz help ty vm if anyone can help i will be very thankfull
switchport trunk encapsulation negotiate: This command enables the port to negotiate the trunking encapsulation protocol (ISL or 802.1Q) with the connected device if DTP is active. If DTP is disabled, the port will not negotiate the encapsulation type, and you must manually configure the encapsulation with switchport trunk encapsulation dot1q or switchport trunk encapsulation isl. switchport nonegotiate: This command disables DTP on the port, which means the port will not send or respond to DTP frames. As a result, the port will not automatically negotiate whether the link should be trunk or access, nor will it negotiate the encapsulation method (ISL or 802.1Q).
You said that unless we use the switchport nonegotiate command, the switches won't stop sending the DTP frames. I used it on both the switches, but they still formed a trunk when both of them were manually configured into the trunk mode. Why?
They form a trunk because they were both manually configured as trunks. You don't need DTP to form a trunk, DTP just allows the switch to automatically determine if the interface should be an access port or a trunk port.
I made notes before but this is probably a good time for me to make elaborate notes and also add info from the book into my Anki set. What's your recommendation of cards to study a day, Jeremy? Mine is set at 200. I feel maybe it's not enough.
@@JeremysITLab thank you for your reply, I didn't know that could be taken off on anki. I'll try to take off the limit. The default is 20 new cards per day.
Hi Jeremy. Thanks for the excellent videos. How long it takes to see the synchronization done between switches. I used the same config in Packet tracer where all the switched were using version 2 and where using default settings. When I added a new vlan and a domain name on the SW1, it didn't synchronize with the other switches where the vlan DB didn't include the newly added VLAN on SW1 and revision number was not updated. The domain name was still null on the other switched. I followed the example in the video.
VTP isn't timer based, messages are only sent out when a change occurs. If you're doing it in packet tracer, occasionally things don't work exactly as they should, though.
They are all on the same domain. If SW2 is in ‘VTP transparent’ mode, it doesn’t matter if it’s in the same domain. It will never sync it’s database to a VTP server. It will however, forward SW1’s advertisements to SW3.
@@JeremysITLab yeah, exactly, that's why I mentioned in my first comment that it almost got me Confused, but then I figured out that they all are in the same domain, thank you very much for your follow up and confirming. 👍
Hey mate, I have actually purchased Kevin wallaces CCNA video's from Cisco press and watched them entirely. All I can say is they're shit compared to the material you produce. You're videos are excellent and the use of anki is AMAZING, It's so under utilized in all education. I really appreciate the effort and will continue to watch / support the channel. Thanks :)
@@JeremysITLab No Worries :) One suggestion regarding Anki. I think some future answers would be helpful if they were accompanied by visuals. For example, a questions asking "how many bytes is the peramble." The answer should include a photo of an Ethernet header. This supplies a visual aid, and helps visually identity the frame as a whole and the preambles location within the header / frame. Here is an example photo I pulled from google. images.app.goo.gl/z4NFjkKK7zFsnRXq8 Thanks again! :)
In quiz, question 1.the switchport on SW1 is assumed to be "access mode", so no trunk will be created when connect to an old Switch with default setting "switchport mode dynamic desirable",isn't it?
They're operating as access mode, it doesn't mean that they were configured as access mode. SW1 could be in "dynamic auto" and the SW2 in "dynamic auto", it will form an access. The old spare switch who replaced the SW2 could be in "trunk" or "dynamic desirable", it will form a trunk. So, the SW1 could be in "dynamic auto" and SW2 was in "dynamic desirable". It formed a trunk.
I guess vlan.dat is stored in flash memory of switch and not nvRAM for VTP servers and VTP clients. Please correct me if I'm wrong @Jeremy Also, I guess there are 4 VTP modes. server, client, transparent and OFF. Please clarify.
Check out this document from Cisco: www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750/software/release/15-0_2_se/configuration/guide/scg3750/swvtp.html#42137 In version 1 and 2, Servers/Transparents store the VLAN configurations in NVRAM. In version 3, all three modes store the configuration in NVRAM. You're right, VTP version 3 has 'vtp mode off' in addition to the three modes of version 1 and 2.
The command 'Switchport nonegotiate' doesn't work on my PT Multilayer Switch. It says, "Command rejected: Conflict between 'Nonegotiate' & 'Dynamic' status". Why? How to use this this command then?
Because the interface is in 'switchport mode dynamic auto' mode by default (=DTP mode), you can't use the 'switchport nonegotiate' to disable DTP mode until it is manually configured as an access or trunk port. Should have mentioned that in the video! Use 'switchport mode access' or 'switchport mode trunk' first, and then try it again.
They're operating as access mode doesn't mean that SW1 was configured as access mode. SW1 could be configured as "dynamic auto" and the SW2 as "dynamic auto" or "access", it would form an access. When SW2 was replaced, SW1 was as "dynamic auto" and the switch who replaced SW2 was as "trunk mode" or "dynamic desirable", it formed a trunk.
Hello Jeremy! In the beginning you said that the DTP and VTP were removed from the topic of the CCNA exam, but what about the next levels, like CCNP or CCIE?
@@JeremysITLab I tried the command "Switchport mode trunk" but getting a reply "Command rejected: An interface whose trunk encapsulation is "Auto" can not be configured to "trunk" mode". Why? How to correct this?
is it normal that im starting to hardly understand anything, and my understanding in english is starting to worsen? will continue to studying in this state do any better?
@@JeremysITLab i do about 3-5 videos per day and flashcard in the end of the day, i didnt do most of the labs in the beginning of the series coz my school already covered some, ah but i didnt do review... i thought the flashcard was the review lol. thanks for the advice, now that i think of it I ended up rewinding the video coz it took me seconds to remember which word is which
Hi Jeremy, I know it may seem to be a stupid question, but could you explain the context of 'advertise', 'advertisement'? Does advertise mean it forwards information to to other switches/routers?
Good question, and you're basically correct. A VTP 'advertisement' includes information about the VLANs that exist on the VTP server switch. The clients receive the advertisement and compare it to their own VLANs, and then update their VLAN database if their VLAN database differs from the information they received in the adverisement. For example, if a client has VLANs 10, 20, and 30 in its VLAN database, and then receives a VTP advertisement from a server with VLANs 10, 20, 30, and 40, the client will update its VLAN database to include VLAN 40.
Quiz Question 1 : I don't get it. SW 1 : access SW 2 : access . It failed and was replaced with another How can it be dynamic auto mode when Jeremy answers? I think it should be access mode like a question.
Hi Jeremy! As for the DTP frames sent in the native VLAN when using 802.1Q. If the native VLAN on one switch is different that the other, let's say SW1 has native VLAN100 and SW2 has native VLAN200, are there will be any problems or DTP negotiation will still be established? Also about VTP if a new switch with higher revision number is added to our topology and it's in the same VTP domain but it is acting like VTP client instead of VTP server, it will still create problems to our topology? All switches will sync their VLAN databases to the new switch?
I try it out and I find some things: 1) DTP negotiation was still established with switches having different native VLANs. Is it correct or it has something to do with packet tracer? 2) In a different scenario I connect three switches in a row. The left one operates as a server, the middle one as transparent and the right one as a client. Server and client are in the same VTP domain and the transparent is in a different one or in null, but VTP advertisements from the server are still received by the client. Why is that? I thought the transparent would forward the advertisements to the client only if it was in the same domain with the server and client. 3) Again another scenario, I connect a new switch in my topology acting as a client with the default null domain and a higher revision number than the main VTP server I had and all switches sync their databases with the new client one. So servers can sync to a client?
Thank You Jeremy for great and easy to follow CCNA course. Using PT with lab19 SW2. I changed VTP to Transparent mode, and change Domain name other than CCNA then I added new Vlan in SW1. Now SW2 shouldn't advertise to other switches (SW3) because it has different domain name correct? but when I checked SW3, I found the new Vlan got listed there automatically. Is that an issue with PT? Thx!
Sidenote for everyone; As Jeremy mentioned in the video, it is recommended to not use DTP nor VTP. Well, DTP can be disabled per port, but VTP can’t be disabled. The best practice to do here is to just put all your switches in VTP mode transparent. If left in the default state, all it takes is anyone connecting a cisco switch, or a linux machine pretending to be a cisco switch, in the network on a trunk and they can freely destroy the whole vlan structure and gain access across vlans Without needing any passwords/secrets.
if you are saying adding a vlan to a switch database increases the revision number then as all the switches are in vtp server mode by default it means that in non vtp topology all the switches will have the same vlan database as that of the switch which has the most VLANs. how is this possible??
Yooo Jeremy ! Thanks again for this great content. I had a question in regards VTP, you mentioned is not really secure and it’s not used in modern networks…so what is used then now a days to synchronize or distribute VLANS across switches in a modern and secure way ?? Regards
As always, great videos! Thanks Jeremey!! Just an observation as I am trying to wrap my head in this subject (everything is new to me by the way)...If it is recommended to disable DTP and to manually configure the ports, than why does Cisco enable DTP by default? Would it not be best to have DTP disabled by default and enabled by the IT tech according to the users parameters?
Yow Jeremy, I just learned that you are also fluent in Japanese. That's amazing! Jeremy's Nihongo Class when? 🤣🤣🤣🤣 Kidding aside, thanks for the lessons, I'm learning very well. 😄
thank you soo much ...this helped me a lot ...by the way many people are unable to pay for practice exam questions ....is there any free resource to prepare for the exam ??
Hello everyone i think there is a problem in quiz question 1 switch 1 interface is configured as acces port so how come it will form trunk port with the older switch i.e. replace in the place of switch 2 and the older switch is default as dynamic desirable
I thank you so much for all these free videos. I am just wondering if by chance you can post these slides? if not for free then possibly through patreon? I would definitely support you for these slides to have. They are so much information. But also just to be able to support you is nice as well.
ERRATA: At 22:34, the slide should read 'VTP Transparent', not 'VLAN Transparent'.
You're the best
Is vtp versions have to match?
Also CCNP and CCIE ENCOR 350-401 Official Cert Guide 2nd Edition (page 96) says that there are 4 roles in VTP, not 3 - Server, Client, Transparent and Off. I suppose it better to be aware of this being preparing for exam.
@@Jaye96 yes. But if your network is too big, is better to use it in transparent mode. If is a few switches, yes have to be the same version.
4.7 millions people watch the first video, less than 300.000 have watch this one. Congratulations you are in the top 7% of the most motivated people 🎉
Unfortunately 100,000 of those views are mine😪
Niceeee. Yes we shall keep on going.
Better to us, I think! 🎉
I believe others could not move on due to unknown reasons and others they might have struggled to understand important concept which is vital in moving on. I.e I struggled for days with subnetting but I kept on rewatching until I understood
@@masanashaunshipalana7622 ChatGPT helps a lot and made me ACE all those Labs so far. I'm on day 2 of my studies and am reaching this video. Helps that I'm on a break from work. Whenever I struggle on something, ChatGPT explains like im an idiot and makes anything easy to understand.
If anyone sees this and they are studying for their CCNA, YOU GOT THIS!!
You got this!!
Thank you very much!
What types of profile picture you have. It's impossible because Biden didn't even to stand up
Hopefully but i lost confidence, i've been studying (very hard) CCNA for 16 months now and i still don't feel like i'm ready
Thank you! Been super stressed about it but determined
I just want to say thanks for these videos. I've tried out multiple courses over the last few weeks, and have constantly felt overwhelmed when watching them. It made me feel like I wasn't up to the task of learning this stuff, and I nearly gave up all together. Your videos were the first time I ever felt capable of understanding the subject matter.
I think most courses simply underestimate the importance of repetition and association. They mostly discuss a subject once, regardless of complexity, and then simply assume you understand everything and move on. The Anki cards you added are really a great resource in that regard. I started out with just the cards you made, but added tons of my own to help me study. There's just so much to remember, but your approach makes it feel managable. So, keep up the good work. Eventhough this course isn't finished yet, your videos are definately what made me decide to get my CCNA.
Thank you so much for this comment, really made my day. I do agree with you about some courses, not just for CCNA but for anything. There are plenty of CCNA instructors with more experience than me (people who have had their CCNA for decades, while I've had my CCNA for 2 and CCNP for 1.5), but I think the fact that I'm still 'fresh' helps me understand what its like to study the material from zero. Hopefully that helps make my course understandable!
Good on you for making your own flashcards too, I highly recommend it. Make your own, delete any of mine that don't work for you, or edit and reword them, etc.
Please tell me how to get to those flashcards.
How to download bcoz I have downloaded it but it's not opening
@@RB-zu1kj when you download it.. go to browser- downloads- click them and it will be exported in Anki app
This seems like a good spot to stop and make sure I am very confident with the previous topics before moving on to STP and beyond.
I was just thinking the same thing.
You couldn't be more correct. I didn't do that now I have a bunch of content to review
I thought I knew what trunking was! Guess I better go back and review that content lol.
Coming into this with zero experience, I have to say that your breakdown of topics is concise, and your incorporation of ANKI is fantastic. I think it's sorely needed throughout various learning tools.
I think I'll be pausing progress here and review a while because I've been in the weeds since day 17. Thank you Jeremy!
3 years later and this man is still reviewing. Good on you.
Today is the 10th day of my study. When I felt perplexed in your videos because of my weak foundation, I opened the official guide. As I looked at the official explanation, I found that it is not as concise as you. The official guide made me more nonplussed. What’s more, I used the “search” function to search keywords, I got too many results. I didn’t know which was the best search result to learn from. Because when I looked at detail, I found more terminology I’ve never seen. Finally I choose to watch your video again.
I had shared your video with my office colleague and he become a big fan of your. I'm always thankful to you for such videos.
Thanks for sharing :)
Thank you! This course explained the concepts so much better than the course i paid thousands for. Wish I discovered you sooner!
Thanks very much Jeremy, you're still empowering us with some great skills. I'm looking forward to learn more and practice as much as I can to pass the new CCNA exam.
Thanks, good luck!
Jeremy, I cannot thank you enough for these videos. I’m using Wendell Odam’s official cert book and netsim for my labs and router sim. Your videos really tie everything together for me. I appreciate the work you put into these!
Thanks Keith, I'm glad the videos are helpful :)
@@JeremysITLab can you please tell me is it must match vtp versions
yeah big man. god bless you for your support and effort .we appreciate it man .please keep going til the end. thank you again
Thank you, I'll keep going ;). Next video coming tomorrow!
I have spent almost 2 weeks on this topic and now it starts to kick in, but it is still challenging. I am moving on but will be back on the Dot 1Q, VTP etc... topics.
Thanks! I dont really have any intention to take the CCNA but this is too good not to learn!
Thanks, glad you like it!
we are really lucky to have you here....Bro keep it up!!!!
Thanks bro! 👍
I just discovered this playlist about a week ago and have been going ham ever since, but didn't know you were still releasing these lessons. When are you planning to have all the lessons done? Just curious because I was planning on taking the CCNA shortly after finishing your lessons.
I'm maybe half way through, check out this post to see how many topics I have covered: th-cam.com/users/postUgyY9wO84s3UBSZ1PcN4AaABCQ
Hi Riley, so did you finish the course by now?!
When I saw VTP/DTP for the first time, I didn't understand very well and it was so difficult to remember, but now if with your explanation it was very easy to understand. Thank you so much!!!
Thanks alot Jeremy for the videos. Your way of explaining is easy to understand for people like us who have less new to the networking field .
Thanks for all your comments ;)
I have a doubt.. if anyone could answer..Thanks in advance..
6:47 A switchport in dynamic desirable mode will actively try to fom a trunk with other cisco switches. It will form a trunk if connected to another switchport in following modes:
Switchport mode trunk and switchport mode dynamic desirable.
29:12 In quiz question 1:
How is trunk formed between two switches?
My understanding is: SW1 interface is operating in access port mode (As per question) and older spare switch will default to switchport mode dynamic desirable. So in this scenario, trunk will not form and both will operate as access ports.
Am I missing something here?
He said that SW1 is in auto mode, so dynamic + auto = trunk
took me a few times to get it. but i finally got it.. it was in the wording of the question.. tricky!@@GroundBeef1
I have been following this course for a while now, its definitely the best CCNA course that I ever took.
Just curious, will you also cover the network automation and programming in this course?
Btw I can't imagine the effort you are putting on making such a course possible for free. When watching these videos I feel confident that after the video I'll have a good understanding of the topic. You are the best teacher. Respect sir!
Thank you for your comment! I will cover all of the CCNA exam topics, but automation will come last (gotta learn about networks before trying to automate them).
Right away you can tell that VTP is not very secure and that someone could potentially spoof as VTP server with a high revision number basically taking control and wrecking havoc.
Exactly 😢
Thanks!
Thanks for showing the features of Boson ExSim and Boson NetSim. It looks really useful
They are very useful!
30:00 mode access and mode dynamic desirable should not form a trunk. So why is it said to be a trunk?
SW1 was set to dynamic auto, not configured manually
@12:30 "The DTP frames that DTP uses to negotiate are sent in VLAN 1 WHEN using ISL". But aren't we using DTP frames to negotiate between ISL or dot1q??
Good question! When the first DTP frames are sent (before the switches have agreed upon access vs trunk and ISL vs dot1q), both interfaces are access ports. So, there is no VLAN tag (no ISL or dot1q tag).
If they then agree that they will form a trunk connection, if they decide to use dot1q the frames are sent untagged in the default VLAN (which is 1), but if they decide to use ISL the frames will be tagged in VLAN 1.
@@JeremysITLab So, Initially if the ports are access ports then how can DTP frames travel within them??
@@sundaramg3439 They just send the frames. Because they are access ports, they don't add VLAN tag (ISL or dot1q tag)
@@JeremysITLab Thank You so Much J. Your responses like this means a lot to the viewers ❤ 👏👏👏
I'm not too sure if it's a mistake, but at 22:34 the slide reads "VLAN Transparent" when I think it should be "VTP Transparent".
Yeah that's a mistake, thanks for pointing it out
It seems first question in quiz is wrong ? How does it make trunk when sw1 in access port and other one in desirable mode
Two things you need to know to solve this question:
1. New Cisco switches default to 'switchport mode dynamic desirable'
2. Old Cisco switches defaulted to 'switchport mode dynamic auto'
The question says the connected interfaces are OPERATING as access ports. It doesn't say they are CONFIGURED as access ports. So, when you remove one of the new switches and connect an old switch, a trunk is formed. Why is that? It's because the NEW switch had the default 'switchport mode dynamic auto' configuration, but the OLD switch which you just connected has the default 'switchport mode dynamic desirable' configuration. Auto + Desirable = a trunk is formed. Before, when the two new switches were connected, both had the default 'switchport mode dynamic auto' configuration. Auto + Auto will operate as an access port.
If anyone is at this point in the course, comment under this comment if you'd like to be a study partner! It gets a little lonely studying alone and would like someone to share what I've learned with and vice versa so we both understand the topic. We will obviously use this same material :)
I am actually starting this section now :)
@@clintongabriels1156 got discord?
just freshly finished this lecture
You pass yet?
you got discord?
Hey Jeremy, I am loving the content. I have a question concerning question 1. If the old switch is in "dynamic desirable" mode by default and SW1 interface is in "access" mode. According to the table shown earlier at 9:58 , wouldn't it become an access port too?
In that case it would become an access port. However the question states that a trunk was formed, so we know that SW1's interface wasn't configured in access mode.
Can someone clarify this for me:
at @17:01 he says "Will advertise their VLAN database, and forward VTP advertisement to other clients over their trunk port".
I understand the second part: they forward the advertisement they receive from the server, buy I don't get the first part: why would a client advertise their database?
this was the longest video i have watched its been a week and just finished it finally. I get really lazy to watch this since DTP and VTP was mentioned to not be usually used nowadays so my brain goes don't learn it but need to finish the video for the sequence of the course and to say that i finished it.
I don't mean to come across as overly critical, but from my understanding, changing a switch's VTP domain name to any other name, whether it's an unused one or not, will reset the revision number to 0, and thanks for your amazing courses!
Sir, you deserve more but I can't do more than a comment, like, share and subscribe!
I mean it...
Hi Jeremy, is it still worthy to do CCNA, CCNP for getting job. Please reply. Thank you
Dear Jeremy,
I think I'm in love..... With your TH-cam channel! Thanks for all that you do. Have a great day!
Thanks for taking the time to leave a comment. Great day to you as well!
Thank you for spending time working hard to make this course it's so clear and easy to remember. Respect You Jeremy.
I am sorry, at 21:58 you say "ALL HOSTS will lose connectivity". I just want to clarify for myself why the hosts will lose connectivity if we do not configure VLANs on the hosts / PCs? Since after synchronization all the data in all switches will be the same, shouldn't the PCs/hosts work? I mean at what point, between what points will there be a mismatch? Maybe between Switch1, which is a server and Router, because In case with Switch Layer 2 traffic goes through Router, which is understood, but if SW layer 3 forward traffic directly to other networks? If this is Native Vlan, then the hosts should not lose connections in this case, in all other cases the hosts will lose their connection, did I understand correctly?
in quiz 1 A) can also be true. If SW 1 is in dynamic mode, it would cause mode trunk comunications between SW1 and old one. Broken SW2 could have been set to access and communication could also be Access since SW 1 is in dynamic mode. correct me if im wrong pls... anyway - thanks for your effort, I'm spreading this course as much as possible to all of my IT friends! big up
Old Cisco switches don’t default to ‘switchport mode trunk’, so A’s statement is incorrect.
Thanks for spreading the course! Glad you like it :)
isnt quiz 1 supposed to form an access port? since SW1 and SW2 were operating as access ports and we switched out SW2 for a switch using dynamic desirable. my only guess is that SW1 is set to dynamic desirable or auto.
Even though this topic isn't covered in CCNA, Jeremy stills manage to make it a 30min long video PACKED with information
Took a two day break due to real life but I'm back. Thank you, Jeremy for another incredible video!
Awesome video , We all learning alot . I'm on my way to get my CCNA
Good luck!
Exsim is awesome. I bought the practice exams.
Nice, it really is a fantastic product for preparing for your CCNA! Definitely go through them to fill in any weak points before taking the real thing.
@@JeremysITLab It gave me an idea of what chapters from the Cert guide I need to study more. Great tool.
About VTP Revisions problem. It seems easy to fix no? When the old switch is added why not reset the revisions as its being added to a different network? Or there could be other solutions put in place. Seems odd to just not use a functionality(as theres a reason it was added in the first place) because of a fixable problem.
Could you please give examples to when is it better to configure a switch port as dynamic desirable and when to configure it as dynamic auto?
Also in VTP, if I connect a new switch to the network, it will not update its database unless a new a modification is done, is there a way to update its database manually?
The only best practice regarding DTP is to disable it. Never use DTP in a real network!
To force the VTP server(s) to send out an update (and make the new switch sync), create a new VLAN on the server and then delete it. It will send out an update each time, and the new switch will sync.
@@JeremysITLab Thanks a lot Jeremy, I know I ask a lot of questions, but that's because I like your course and I would really like to get the most out of it.
Nice demonstration of VRP
Thanks
You mentioned VTP is Dangerous if Latest revision comes in ..what else to use for auto vlan management
the best explanation about DTP and VTP that ever I had heard. Thank you.
Thank you Jeremy! I hope you have a great day.
Thank you, same to you!
At 13:15, so if I configure both switches with either dynamic desirable/dynamic auto/trunk mode, but after that make sure to configure "switchport nonegotiate", will the nonegotiate override? Or will the switches still send DTP frames?
Try it out in packet tracer!
@@JeremysITLab haha silly me i missed your lab. the very first task you put on your lab answers my question. again awesome lab! thanks so much for all your efforts into your course! it just gets better and better!
Is ISL really favored over Dot1Q? Cisco sources say Dot1Q is more commonly used and preferred
Thanks a lot for your efforts 🙏
I just want to ask if these 34 videos enough to pass CCNA EXAM ?
or I would need to study from extra sources ?
This course isn't finished yet, so you will need extra resources for sure!
I trust you and i will study with your videos step by step until you finish .
Thanks again Jeremy
so these amazing videos has been on youtube for 3 years and i didn't watch them? :(
No better time than the present!
Hey jeremy ur videos are pure pleasure to watch i till now couldnt find more easy explicit contznt as yours out there just one question i couldnt wrap my mind around the meaning of dot1q frameq are sent in native vlan and isl frames in vlan1?? Can u plz help ty vm if anyone can help i will be very thankfull
switchport trunk encapsulation negotiate:
This command enables the port to negotiate the trunking encapsulation protocol (ISL or 802.1Q) with the connected device if DTP is active.
If DTP is disabled, the port will not negotiate the encapsulation type, and you must manually configure the encapsulation with switchport trunk encapsulation dot1q or switchport trunk encapsulation isl.
switchport nonegotiate:
This command disables DTP on the port, which means the port will not send or respond to DTP frames.
As a result, the port will not automatically negotiate whether the link should be trunk or access, nor will it negotiate the encapsulation method (ISL or 802.1Q).
Hey Jeremy.
What is then used instead of VTP to advertise the VLAN information toe the Neibourgh switches.
You said that unless we use the switchport nonegotiate command, the switches won't stop sending the DTP frames. I used it on both the switches, but they still formed a trunk when both of them were manually configured into the trunk mode. Why?
They form a trunk because they were both manually configured as trunks. You don't need DTP to form a trunk, DTP just allows the switch to automatically determine if the interface should be an access port or a trunk port.
@@JeremysITLab Thanks Jeremy.
I made notes before but this is probably a good time for me to make elaborate notes and also add info from the book into my Anki set.
What's your recommendation of cards to study a day, Jeremy? Mine is set at 200. I feel maybe it's not enough.
I don't set any limit for the number!
@@JeremysITLab thank you for your reply, I didn't know that could be taken off on anki. I'll try to take off the limit. The default is 20 new cards per day.
Hi Jeremy. Thanks for the excellent videos. How long it takes to see the synchronization done between switches. I used the same config in Packet tracer where all the switched were using version 2 and where using default settings. When I added a new vlan and a domain name on the SW1, it didn't synchronize with the other switches where the vlan DB didn't include the newly added VLAN on SW1 and revision number was not updated. The domain name was still null on the other switched. I followed the example in the video.
VTP isn't timer based, messages are only sent out when a change occurs. If you're doing it in packet tracer, occasionally things don't work exactly as they should, though.
Hi Jeremy If two switchport are dynamic desirable ? can make trunk!
jeremy you said that both dtp and vtp are not on the exam topics list but our teacher says that dtp is on the topic list
Here's the CCNA exam topics list: www.cisco.com/c/dam/en_us/training-events/le31/le46/cln/marketing/exam-topics/200-301-CCNA.pdf
I struggled in the 10 minutes of the lecture but the rest of the tutorial is much more enjoyable
Switches can operate on access mode when connected to other switches?!
You are a great teacher. Thank you very much.
I would like to know,
how oft do you upload or make these videos?
Once a week!
Hi Jeremy. Great job!
But VTP doesn´t include in the CCNA.
At least that´s what the CISCO CCNA 200-301 Books says. What do you think?
Thanks a lot
Watch the video, I mention my thoughts about that multiple times :)
Quiz Q2 almost got me confused, I figured that all switches are on the same domain, but I believe it's worth mentioning.
They are all on the same domain. If SW2 is in ‘VTP transparent’ mode, it doesn’t matter if it’s in the same domain. It will never sync it’s database to a VTP server. It will however, forward SW1’s advertisements to SW3.
@@JeremysITLab 24:40 in that example you mentioned that if it was on different domain, sw4 won't get the sw2 advertised vtp, or maybe I misunderstood
@@5Incognito Yes, but in Q2 it doesn't say they are in different domains.
@@JeremysITLab yeah, exactly, that's why I mentioned in my first comment that it almost got me Confused, but then I figured out that they all are in the same domain, thank you very much for your follow up and confirming. 👍
12:18 Isn't 802.1q is preferred over ISL in Cisco devices as I remember in previous video?
Hi Louis! Can you point out where I said Cisco devices will select 802.1Q over ISL?
@@JeremysITLab Hi Sir, it's on day 17 lecture video, 7:15
Great job Jeremy, keep up the good work.
Hey mate, I have actually purchased Kevin wallaces CCNA video's from Cisco press and watched them entirely. All I can say is they're shit compared to the material you produce. You're videos are excellent and the use of anki is AMAZING, It's so under utilized in all education. I really appreciate the effort and will continue to watch / support the channel.
Thanks :)
Wow thank you! I totally agree about Anki, I wish I knew about it when I was in school, it would have made things MUCH easier.
@@JeremysITLab No Worries :) One suggestion regarding Anki. I think some future answers would be helpful if they were accompanied by visuals. For example, a questions asking "how many bytes is the peramble." The answer should include a photo of an Ethernet header. This supplies a visual aid, and helps visually identity the frame as a whole and the preambles location within the header / frame.
Here is an example photo I pulled from google.
images.app.goo.gl/z4NFjkKK7zFsnRXq8
Thanks again! :)
4:48 switch port enabled you said because it layer 2 switch but your using a multilayer switch 1 it operates on layer 3 am I telling right?
I said 'layer 2 port'. Multilayer switches are still switches, they can have switch ports and routed (Layer 3) ports.
@@JeremysITLab ok thanks
In quiz, question 1.the switchport on SW1 is assumed to be "access mode", so no trunk will be created when connect to an old Switch with default setting "switchport mode dynamic desirable",isn't it?
They're operating as access mode, it doesn't mean that they were configured as access mode. SW1 could be in "dynamic auto" and the SW2 in "dynamic auto", it will form an access. The old spare switch who replaced the SW2 could be in "trunk" or "dynamic desirable", it will form a trunk.
So, the SW1 could be in "dynamic auto" and SW2 was in "dynamic desirable". It formed a trunk.
I guess vlan.dat is stored in flash memory of switch and not nvRAM for VTP servers and VTP clients. Please correct me if I'm wrong @Jeremy
Also, I guess there are 4 VTP modes. server, client, transparent and OFF.
Please clarify.
Check out this document from Cisco:
www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750/software/release/15-0_2_se/configuration/guide/scg3750/swvtp.html#42137
In version 1 and 2, Servers/Transparents store the VLAN configurations in NVRAM. In version 3, all three modes store the configuration in NVRAM.
You're right, VTP version 3 has 'vtp mode off' in addition to the three modes of version 1 and 2.
@@JeremysITLab thanks for the link. I will check it out.
Thanks you so much for this series. Learning alot :)
The command 'Switchport nonegotiate' doesn't work on my PT Multilayer Switch. It says, "Command rejected: Conflict between 'Nonegotiate' & 'Dynamic' status". Why? How to use this this command then?
Because the interface is in 'switchport mode dynamic auto' mode by default (=DTP mode), you can't use the 'switchport nonegotiate' to disable DTP mode until it is manually configured as an access or trunk port. Should have mentioned that in the video! Use 'switchport mode access' or 'switchport mode trunk' first, and then try it again.
@@JeremysITLab Thanks Jeremy!
can you please make a video on wireless routers configuration in a big firm?
for quiz question 1, as sw1 interface is access port, and old swtich sw2 is switchport mode dynamic desirable, isn't its a mismatch???
They're operating as access mode doesn't mean that SW1 was configured as access mode. SW1 could be configured as "dynamic auto" and the SW2 as "dynamic auto" or "access", it would form an access. When SW2 was replaced, SW1 was as "dynamic auto" and the switch who replaced SW2 was as "trunk mode" or "dynamic desirable", it formed a trunk.
Hello Jeremy! In the beginning you said that the DTP and VTP were removed from the topic of the CCNA exam, but what about the next levels, like CCNP or CCIE?
You will need to know them for the higher level exams!
Hi Jeremy - I haIs it common to set all the switch ports to trunk on native vlan1? and why is that? Thank you sir~
Hi Jeremy. I re-watched the video again. I understand now. Thank you very much sir.
Nice, I'm glad you understand it :)
How to change the administrative mode of a switch from Dynamic auto to trunk or Dynamic desirable?
Here are the commands:
Trunk: SW(config-if)# switchport mode trunk
Dynamic auto: SW(config-if)# switchport mode dynamic auto
Dynamic desirable: SW(config-if)# switchport mode dynamic desirable
@@JeremysITLab Thanks Jeremy!
@@JeremysITLab I tried the command "Switchport mode trunk" but getting a reply "Command rejected: An interface whose trunk encapsulation is "Auto" can not be configured to "trunk" mode". Why? How to correct this?
@@prashantkiratkar.5747 Watch this video from 17:20: th-cam.com/video/Jl9OOzNaBDU/w-d-xo.html
@@JeremysITLab Thanks Jeremy, i got it after thinking over it a little more.
What is a domain? What is the difference between a VLAN and a domain?
is it normal that im starting to hardly understand anything, and my understanding in english is starting to worsen? will continue to studying in this state do any better?
How quickly are you going through the videos? Are you doing the flashcards, labs, and are you reviewing?
@@JeremysITLab i do about 3-5 videos per day and flashcard in the end of the day, i didnt do most of the labs in the beginning of the series coz my school already covered some, ah but i didnt do review... i thought the flashcard was the review lol. thanks for the advice, now that i think of it I ended up rewinding the video coz it took me seconds to remember which word is which
What if a switch doesn’t have a domain name set ? it will join the domain automatically?
Yep! Try it out in Packet Tracer, it should work.
Jeremy's IT Lab I did already and it does join the domain thank you Jeremy
Hi Jeremy, I know it may seem to be a stupid question, but could you explain the context of 'advertise', 'advertisement'? Does advertise mean it forwards information to to other switches/routers?
Good question, and you're basically correct. A VTP 'advertisement' includes information about the VLANs that exist on the VTP server switch. The clients receive the advertisement and compare it to their own VLANs, and then update their VLAN database if their VLAN database differs from the information they received in the adverisement.
For example, if a client has VLANs 10, 20, and 30 in its VLAN database, and then receives a VTP advertisement from a server with VLANs 10, 20, 30, and 40, the client will update its VLAN database to include VLAN 40.
@@JeremysITLab Got it. Thank you for the explanation.
Quiz Question 1 : I don't get it.
SW 1 : access
SW 2 : access . It failed and was replaced with another
How can it be dynamic auto mode when Jeremy answers? I think it should be access mode like a question.
How to change a VTP domain to an unused domain to reset the revision no?
You can change the VTP domain with this command: vtp domain (domain-name).
@@JeremysITLab Thanks Jeremy!
Hi Jeremy! As for the DTP frames sent in the native VLAN when using 802.1Q. If the native VLAN on one switch is different that the other, let's say SW1 has native VLAN100 and SW2 has native VLAN200, are there will be any problems or DTP negotiation will still be established? Also about VTP if a new switch with higher revision number is added to our topology and it's in the same VTP domain but it is acting like VTP client instead of VTP server, it will still create problems to our topology? All switches will sync their VLAN databases to the new switch?
Try it out in packet tracer!
I try it out and I find some things:
1) DTP negotiation was still established with switches having different native VLANs. Is it correct or it has something to do with packet tracer?
2) In a different scenario I connect three switches in a row. The left one operates as a server, the middle one as transparent and the right one as a client. Server and client are in the same VTP domain and the transparent is in a different one or in null, but VTP advertisements from the server are still received by the client. Why is that? I thought the transparent would forward the advertisements to the client only if it was in the same domain with the server and client.
3) Again another scenario, I connect a new switch in my topology acting as a client with the default null domain and a higher revision number than the main VTP server I had and all switches sync their databases with the new client one. So servers can sync to a client?
Thank You Jeremy for great and easy to follow CCNA course.
Using PT with lab19 SW2. I changed VTP to Transparent mode, and change Domain name other than CCNA then I added new Vlan in SW1. Now SW2 shouldn't advertise to other switches (SW3) because it has different domain name correct? but when I checked SW3, I found the new Vlan got listed there automatically. Is that an issue with PT? Thx!
Sidenote for everyone;
As Jeremy mentioned in the video, it is recommended to not use DTP nor VTP.
Well, DTP can be disabled per port, but VTP can’t be disabled.
The best practice to do here is to just put all your switches in VTP mode transparent.
If left in the default state, all it takes is anyone connecting a cisco switch, or a linux machine pretending to be a cisco switch, in the network on a trunk and they can freely destroy the whole vlan structure and gain access across vlans Without needing any passwords/secrets.
Correct! Actually VTPv3 solves the major problems with VTP, although I still don't use it in my networks and I think many others don't as well.
Hi bro ! When will this ccna course end ???
And brw superb explanation!!!
It'll end sometime this year, not sure exactly when.
if you are saying adding a vlan to a switch database increases the revision number then as all the switches are in vtp server mode by default it means that in non vtp topology all the switches will have the same vlan database as that of the switch which has the most VLANs. how is this possible??
Yooo Jeremy ! Thanks again for this great content. I had a question in regards VTP, you mentioned is not really secure and it’s not used in modern networks…so what is used then now a days to synchronize or distribute VLANS across switches in a modern and secure way ?? Regards
As always, great videos! Thanks Jeremey!!
Just an observation as I am trying to wrap my head in this subject (everything is new to me by the way)...If it is recommended to disable DTP and to manually configure the ports, than why does Cisco enable DTP by default? Would it not be best to have DTP disabled by default and enabled by the IT tech according to the users parameters?
Are there certain sections of Boson ExSim I can use to study or get practice question on?
Thank you Jeremy, God bless you brother
Yow Jeremy, I just learned that you are also fluent in Japanese. That's amazing! Jeremy's Nihongo Class when? 🤣🤣🤣🤣
Kidding aside, thanks for the lessons, I'm learning very well. 😄
No plans at the moment :P
thank you soo much ...this helped me a lot ...by the way many people are unable to pay for practice exam questions ....is there any free resource to prepare for the exam ??
Hello everyone i think there is a problem in quiz question 1 switch 1 interface is configured as acces port so how come it will form trunk port with the older switch i.e. replace in the place of switch 2 and the older switch is default as dynamic desirable
Jeremy! Love the videos. Is there a day 19 video Lab?
Looking forward for the next one.
Thanks alot !
Thanks! Next one will be coming this weekend.
I thank you so much for all these free videos. I am just wondering if by chance you can post these slides? if not for free then possibly through patreon? I would definitely support you for these slides to have. They are so much information. But also just to be able to support you is nice as well.
Does dtp only work on layer 3 switches ?
Nope, it should work on any Cisco switch!
Why is it possible to get questions of that if its not in syllabus