Free CCNA | NTP | Day 37 | CCNA 200-301 Complete Course
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- เผยแพร่เมื่อ 7 ก.ค. 2024
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In Day 37 in this free CCNA 200-301 complete course, you will learn about NTP, Network Time Protocol.
In this FREE and COMPLETE CCNA 200-301 course you will find lecture videos covering all topics in Cisco official exam topics list, end-of-video quizzes to test your knowledge, flashcards to review, and practice labs to get hands-on experience.
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0:00 Introduction
0:59 Things we'll cover
1:44 The importance of time
3:35 'show logging'
5:29 Manual time configuration
6:53 Hardware Clock configuration
8:41 Time Zone configuration
10:23 Daylight Saving (Summer) Time
12:42 Manual time configuration review
13:03 Network Time Protocol intro
16:13 Reference clocks
16:57 NTP Hierarchy
18:53 NTP configuration
28:18 NTP Server mode
30:42 Symmetric Active mode
31:34 NTP authentication
33:56 NTP Command review
34:10 Things we covered
34:59 Quiz 1
35:35 Quiz 2
36:10 Quiz 3
37:26 Quiz 4
38:08 Quiz 5
39:08 Boson ExSim
#cisco #CCNA - วิทยาศาสตร์และเทคโนโลยี
ERRATA:
32:16 The 'ntp authenticate' command isn't needed to enable NTP authentication. It is only needed when using 'ntp passive', 'ntp broadcast client' or 'ntp multicast client' - all beyond the scope of the CCNA exam. Check out www.cisco.com/c/en/us/td/docs/ios-xml/ios/bsm/command/bsm-cr-book/bsm-cr-n1.html#wp2231112076 for more information.
To be fair, lots of other Cisco documentation and CCNA study materials state that this command is necessary, but that seems to be a misunderstanding. Try it out on some Cisco routers and you'll see it's not necessary!
Hello Jeremy and anyone finding this course helpful. I passed my CCNA last night and I can say that this course helped more than any other resource. For those preparing, who have taken CompTIA, this is far different than them. I had 86 questions and 4 labs, you can only move forward in the test, no flagging for review, no going back to change an answer so be prepared for that. I commented on the NTP video because 3 of my 4 questions had NTP setup with peers and clients. Two had setting up SSH connections. One was all VLANS and trunking. I got none on OSPF or STP which is where I spent the majority of my practice after reading about others experiences. I also used Boson practice tests. I also had quite a few regular questions on Wireless LAN setup and SDN. SDN was actually my strongest category which was strange since in Boson tests, Security was always my strongest, in the exam it was my weakest. Either way, thanks Jeremy! These are the best video resources and I commend you for taking the time to create these and all the resources and labs and provide them for free.
Congrats on getting your CCNA! That's a major achievement, well done - I'm sure you studied a lot! And thanks so much for the generous tip; I really appreciate it :)
Congrats
Congratulations. Thanks a lot for information. it is interesting that you got none of OSPF or STP labs.
That's insane that you didn't get any STP or OSPF labs!!!! My first attempt, I couldn't even count how many questions I got about OSPF and IPv6, my two weakest categories back then. It appears everyone's exams can vary wildly and that you really have to be prepared for anything and everything.
whoever's studying and has come across this video on NTP... don't sleep on it! I was super confident on my ccna exam but I skipped over NTP during my studies because I felt it wasn't a huge topic to go into... i got like 5 questions that were related to NTP and I'm pretty sure I bomb'd them all. I got a 823 because of it and just missed the exam by 2 points LOL. I'll get it next time.... !!!
lol thanks for the comment. I was thinking of skipping this video. Good luck on your next one!
That's insanely stupid, failing a ccna because you don't care about setting canadian timezones
@@sunburst8810 For real man wtf, this seems like such a trivial dumb topic that is at the same time needlessly complicated. FFS
@@DaddyDagoth I dont think we need to know about the manual configuration.. the exam topics clearly states we need to be able to configure and verify NTP operating in client and server mode.. This definitely shouldnt be a 40 min video
@@DaddyDagoth It is a very important security, performance and auditing feature. Lots of hackers attempt to screw up the timers and date/time stamps so you cannot see what was done in logs. Furthermore, having accurate and verified time stamps will increase the performance of the network. NTP is super super important. Learn thoroughly.
Being your channel members for years, I now can finally say i passes my CCNA exam last week !!!
thank you so much Jeremy for providing this complete course as I wouldn't have made it without your effort
To those who are preparing CCNA, just wanna share with you guys that the exam would contain 2-3 lab question which need you to do some hands on configuration, mine was involving in OSPF, ether channel and NTP and of course they carry huge portion of the marks so be prepare if you wanna score well : )
Welcome to Jeremy's IT Lab, today we'll learn about Jeremy's country of origin & Country of residency. Jeremy was born in Canada, but this is an old technology and nobody uses it, Jeremy moved to Japan because their network is much faster.
the mystic Jeremy Lore E X P A N D S
Jeremy your course was instrumental in helping me pass my CCNA today! got a score of 895 first try!
Awesome, so glad to hear that! 895 is a great score 👍
What other study materials did you use to cover other topics? My exam in is on 20th feb and I have very limited time to cover up and do exam practice.
@@neevpatel9926 How was your exam? I hope everything went well.
@@gee40trots I passed the exam with over 900 marks
@@neevpatel9926 wow that's a huge cut congratulations 👏👏👏👏
At this point i am just overwhelmed. I feel like the amount of information stored in my brain will flood out just like a switch floods out unknown unicast frames. So many mac addresses to remember and so many commands that are, is it just because I have not started my revision ( as i plan to finish the series first and then revise myself by using boson and revise the topics whose answer I fail to answer correctly. Ps I USE THE ANKI FLASH CARDS but at this point i think theres so much to remember and also 20 more videos info, commands, concepts.
So how did it go?
As a long time network admin, time synchronization is critical to a healthy network across all devices! Others have thought of skipping this topic. I would suggest giving this video the time it deserves! (pun intended!).
Thank you for the great series! Passed my CCNA three days ago
Awesome! Congrats Keyshawn! From experience I know the CCNA is a tough exam to pass
What materials did you use? Please help
Thank you so much Jeremy, your videos are always the best, may God give you the strength to keep on supporting us with your super informative resources.👏👏
Great video and one thing I would like to add is NTP dependency on L4 protocol and port. NTP uses UDP port 123 as both source and destination ports. It’s a fancy port number and easy to remember.
I love you, Jeremy, you are the greatest and the most helpful and generous person that I ever met, my life will change because of you !
Awesome series! Thanks Jeremy!
Thank you Jeremy for uploading all of your videos. I watch them all. I am confident understanding related to networking. However I'm working on Fiber Optic System. More power to you Sir!
Thanks for watching, Wilfred!
Many thanks Jeremy. Your lectures have helped me alot to understand networking. God bless you
Thank you! Glad to hear that :)
Simply amazing. Thank you Jeremy!
Thanks, Piotr :)
Ahh one more video before I go take the test! Thanks Jeremy! Wish me luck!
Good luck! What day is your exam?
Please never give up on these
Don't worry, I won't! :)
Finally finished this topic as well. most difficult thing about this topic is packet tracer don't have some of the commands. So, I had to practice on Cisco CML.😀
Thanks Jeremy you have no idea how much i look forward to tuesdays
Haha glad to hear that
Waiting for your other IP services topics. Glad i found this channel
Gonna cover them all over the next few months 👍
thanks Jeremy for the high value lecture.
Hello Jeremy , great video channel , thank you Jeremy for all your efforts to deliver such great content !
Thanks Samir :)
Thank you Jeremy for all those videos
Thank you Jeremy, your lessons are very simple and very productive, they helps me very much. I am going to pass exam after a month and it breaks my heart that i can not complete whole course :(
I hope you'll follow along even after you pass ;)
Thanks for the video Jeremy! Really appreciate it
Thanks for watching :)
Thank you for video. Thank you Jeremy, from Lima Perú.
Thanks for watching :)
You're awesome!
You're early this week ! thank you my man !
Only a couple hours ;)
Thanks, Jeremy another great learning video! You and David Bombal are my inspiration to keep learning in regards to networking. I'm looking forward to your next video any hint? 😊✌
Next video will be the lab for this video, so NTP again!
thank you so much.i learned lot of facts from this video
Default stratum level of router's internal clock is 7
Thank you for the Video lessons.
Thanks
Thank you so much Jeremy ...
Thanks for watching :)
Thanks Jeremy
greetings jermey, keep up the great work
Thank you! :)
tysm
Thank you for this video!
Thanks Miguel :)
Ty jfoe your hard work. I really love your course...
Thank you :)
Thanks Jeremy.
Thanks, Stephen :)
As always great stuff!! thank you!!
I think part of it a little bit out of scope but it's really hard to know.
Which parts?
I agree, it's hard to determine from '4.2 Configure and verify NTP operating in a client and server mode' exactly what is included.
Thank you Jeremy :-)
Thanks for watching :)
Brilliant.
Thanks a lot, God bless you!
Thanks for watching :)
Thanks Jeremy!!!
Thanks for watching :)
as always a great lesson, plenty of thanks
Thank you :)
thanks Jeremy ,,KE
Thanks for watching :)
Hi Jeremy. Please check your "clock summer-time" flash card. I believe it has the 'name' and 'recurring' keyword/option reversed
Thanks for the video
Thanks for all your comments :)
Thanks so much!
Thanks for watching :)
more information as i expected
Well done
Thank you!
Hi sir/ you're all vedio is a great and all time chife and best / l like this your ,/i am a biginer ccna student
Thanks for watching :)
i think there is a typing mistake at 33:41, bottom line ntp peering configured for R2 , it should be R3. Correct me if iam wrong. :)
Thank you Jeremy. You're great as usual. I am starting to be worried about CCNA the amount of information to know is huge, and I am not being dramatic!
The default stratum of ntp master is 7 or 8, this is something that I didn't understood. I've google It and I more confused I found this : "Default stratum level of router’s internal clock is 7"
When you use the 'ntp master' command, the router's NTP stratum level will be 8. It is syncing to itself (its internal clock), so in that case you can say the internal clock's stratum is 7.
You live in Japan? Wow !! Hello neighbor! Must be a trip working as a network engineer here.
Great video. Is it possible to set up NTP in fortigate firewall pointing out to data center controller?
Many thanks for the videos.
how many additional videos do you plan to make ?
i finished one different course which also helped much. I thought i can finish your videos earlier but it seems that you continue to help people in an understandable way and will not finish in short term.. Keep going..:) .
I also recommend every lecturers to use touchscreen PC or a tablet to take not on the videos capturing screen. Upon saving pictures, it is easy to repeat . With doing so, i finished my 100+ videos in 15 days when repeating.. i also started your videos with same tactic. I recommend Epic Pen application to note on the screen...You also need a good smart pen to use on the PC screen. Good luck to all learners...
The course is about 70% complete
@JeremysITLab I'm confused on the quiz 3 , normally the answer should be D because the default stratum is 7 when we configure the ntp master
Thank you Jeremy, will you cover CCNP course after this?
Probably, but I'm not 100% decided
Thanks for the video and hardwork!!! Quick question. After tackling the ccna, what would you recommend next? I see videos where the devnet cert should be knocked out next, while others consider going straight for the ccnp, or even cloud certs.
CCNP, in my opinion. Depends on what kind of job you want, though.
16:30 The clocks in GPS satellites are atomic clocks
indeed they are
@@JeremysITLab Thanks for the series. I’m on day 45 now and feel confident that I have the minimum knowledge to pass the exam. I’ll finish out the series before testing and supplement as needed, but I can’t begin to express how valuable this [free] course has been.
I think the
clock summer-time recurring name start end [offset] at 12:48 should be
clock summer-time name recurring start end [offset]
Hello Jeremy,
I have question,
What is NTP Mode 6 Vulnerability and how can we solve it?
For the clock summer-time command does the name go before or after 'recurring'? You mentioned both at 12:36 and then in the listed commands at 12:45
good1000%
At 12:42, shouldn't it be R1(config)# clock summer-time name recurring start end [offset]
instead of
R1(config)# clock summer-time recurring name start end [offset]
?
u used bosom and CCNA Gold Bootcamp: for the ccna ? whats at this time the best choice ?
Waiting for QoS
How many videos do you plan this Course to have ? How complete is it now ? Also, thank you so much for making the effort of publishing this amount of knowledge for free!
The course is about 70% complete. It'll be finished this year, but I'm not sure exactly when.
heavy topic
Hi jeremy i am asking can we get the slides that you explain from it will be very helpful
In the Anki Flashcards for this episode, there is a question about how to configure daylight saving time, and the answer says that start and end requires "day, weekday, month and time", but I believe it should be "week (first, last, number), weekday, month and time". Can you please check? Wouldn't like to mess that up on the exam... ;-)
You're right, fixed it! Thanks :)
On a Cisco WS-C3850-24P i don't have the "show calendar" option. Why is that?
How is one suppose to memorize the overall Cisco commands for this 200-301???? The way the exam has been re-structure makes me think they trying to hinder people (mainly ones without any experience) from being successful on the exams. Good think we have Jeremy to guide us through.
The previous version actually required more knowledge of configurations/commands! This new version adds more theoretical stuff (although you do of course still need to know lots of configurations!)
It seems Packet Tracer does not allow for the configuration of Day Light Savings, nor does it allow for the clock update-calendar and clcok read-calendar commands
Sir please make a video on how to configure a router from first
I explain how to configure routers in other videos
For your final example : why it is not D ?
ntp server {address | hostname}: NTP client/server mode-the device acts as both client
and server. First, it acts as an NTP client, to synchronize time with a server. Once synchronized,
the device can then act as an NTP server, to supply time to other NTP clients.
Are you asking about the Boson example? 'NTP SERVER x.x.x.x' configures the device to synchronize its time to the server specified in the command. This is static client mode.
After synchronizing to that server it CAN be a server for other NTP clients, but in this case A is definitely the more correct answer.
@@JeremysITLab Thank you for the explanation
I live in a country that has daylight savings, and I have no idea when it begins and ends exactly because every clock in my home does it on its own. I had to look it up lol
Sometimes it is annoying, some commands you teach or illustrate during lecturing are not in packet tracer.
Unfortunately many commands aren’t available in packet tracer, but it’s good enough for the CCNA. Definitely look into other options for further study after the CCNA though.
Hello Jeremy, I would like to ask something about NTP. How can Routers, which are layer 3 devices, can communicate to a layer 7 level protocols? I am a bit confused about this. Maybe i misssed something.
Your course is great. It is the reason i started learning networking. Thanks
I think im kind of retarded but I'll give this question a crack lmfao. Routers just forward packets to the destination it needs to reach via a next hop address if it has. I don't think it cares about communicating with anyhting beyond its layer as layer 7 is purely created by hosts that need whatever is going on over their lol. The routers job is just to make sure stuff is getting where it needs to be.
@12:43 in the last should "name" & "recurring" be swapped 🤔
leaving comment for utoob algorythm
Much appreciated ;)
Is there a downside to having several ntp servers specified? An example - we have switches configured as ntp servers syncing to an external server. But sometimes these are not configured correctly or have other issues. In some configurations of our networks t different locations, there may not be a ntp server switch, so the devices on the LAN sync directly to the external sources. It has been a source of confusion for people with inconsistent ntp server settings, so I'm wondering if it isn't the easiest to simply configure our standard switch IPs as wel as the external server IPS (so we'd have 4 ntp servers instead of 2) for every device and if they automatically pick the best one, I should be set right? Is there a downside to this configuration?
Nah, you're literally setting yourself up with redundancy to multiple NTP servers incase shit hits the fan lol.
please tell us the resources from which u prepare those lectures,
any References or books
thanks in advance
I already know the topics, so I mostly use documentation from the IEEE/IETF + Cisco documentation to make sure the details are correct.
Hello there!! I was wondering when this course would be completed or how many days are there in total? thanks
The course is about 70% complete. It will be finished this year.
I didn't really understand Quiz 3: Why did we select 9 instead of 8?
Hi Jeremy, I would like to ask something, when we use ntp master command, the router will sync to its internal clock, the "internal" in this scenario means software clock or hardware calendar? thanks in advance
It'll sync to the software clock in this case
@@JeremysITLab thanks
Thank you Jeremy Sir 🙏 Instead of using 127.127.1.1 address for master clock. Can we specify any other loopback address to use as it's NTP master clock.
Your answer is at 37:05 ;)
@@JeremysITLab Thank you sir🙏
Thanks for everything, I wanted to ask you what do you think how long will it take until you cover all fields? thanks again .
The course is about 70% complete
@@JeremysITLab thank you for your Reply much appreciated Sir.
Now Jeremy, I wouldn't say that loopback address and loopback interface are "totally" different....
Thank you Jeremy Sir 🙏 I want to set the Time Zone of IST ( India Standard Time ) . Offset between UTC and IST is +5.30 ahead. So what should be the correct command.
The command is 'clock timezone (name) (hours-offset) (minutes-offset)' So, the name is IST. Then the hours (5) and minutes (30).
@@JeremysITLab Okk Sir Thank you 🙏
Until it was said, I thought JST might be "Jeremy Standard Time". :D
For the NTP key-number does it have to match on both client and server? Obviously, the key itself has to be the same but can the numbers be different per machine?
Yeah I'm pretty sure they have to match too...try it out in packet tracer!
@@JeremysITLab yup they have to match on both client and server, thanks for making me try myself
clock set is the only command i can use in packet tracer in # mode. calendar set, calendar-update and calendar-read ; for example, do not work in any mode in packet tracer. am i the only one having this issue ?
Unfortunately lots of commands aren't supported in packet tracer.
WHERE CAN I GET THE FLASH CARDS FOR THIS TOPIC
@33:10 it should be R3 in the last line, shouldn't? 🤔
is ntp concept important for firewall or network security engineer...?
Yes! All devices should have accurate time and NTP can be a vulnerability, so security engineers should know it well.
Hhmm. I didn't understand why quiz 3 is A right answer =( I thought is C. Because NTP master equal 8 which we see in command line.