What are VLANs? -- the simplest explanation
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- เผยแพร่เมื่อ 9 มิ.ย. 2024
- The concept of VLANs explained simply and illustrated effectively showing you the purpose and functionality of VLANs.
This is the video version of the content of this article:
www.practicalnetworking.net/s...
Did you like the illustrations and animations in this video? Most of them are available for download for free in the article above.
Want to learn more about VLANs? Check out pracnet.net/vlans
Want to learn how to Configure VLANs?
www.practicalnetworking.net/s...
Want to see the Native VLAN in action?
• Native VLAN - the DEFI...
Studying for a Networking certification like the Net+ or CCNA? If so, check out:
www.practicalnetworking.net/i...
Think you understand VLANs? Test yourself against the VLAN Challenge:
www.practicalnetworking.net/s...
What happens when there is a Native VLAN mismatch?
www.practicalnetworking.net/s...
Want to learn Computer Networking?
• Networking Fundamentals
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More free resources discussing Network Engineering and Network Security:
www.PracticalNetworking.net
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00:00 - Topology Intro
00:24 - Splitting one Physical Switch into Virtual Switches
01:47 - Extending Virtual Switches to other Physical Switches
03:19 - Access Ports, Trunk Ports, Tagged Ports, Untagged Ports
04:46 - VLAN Tags and 802.1q
06:55 - Logical Topologies vs Physical Topologies
07:31 - Native VLAN
10:20 - Summary of what we've learned
Summary:
VLANs provide two major functions:
- Break up physical switches into virtual "mini switches“
- Extend the virtual "mini switch" to multiple physical switches
VLANs allow your Logical topology to be unconstrained by your Physical topology
Access Ports / Untagged Ports - ports which carry traffic for only ONE VLAN
Trunk Ports / Tagged Ports - ports which carry traffic for MULTIPLE VLANs
All frames traversing a Trunk port must be "tagged" so the receiving switch knows what VLAN to associate that traffic to.
802.1q - open standard for how to tag Layer 2 frames
Native VLAN - The one VLAN which traverses a Trunk/Tagged link without a VLAN tag
#vlans #networking #ccna - วิทยาศาสตร์และเทคโนโลยี
This video is instructional perfection. I have been looking for just this kind of video since I began studying for the CCNA. Clear, SIMPLE, and effective animated illustration combined with a concise explanation of the concepts and mechanisms. You have outdone all other paid and unpaid learning resources! The only thing missing from your channel is...more videos! Subscribed!
Thanks for the kind words =). I'm truly humbled.
I am halfway through and stopped to say I already learnt more than what I've learned in 2 years in uni about VLANS plus trunk and access, thank you, sir.
Ha, awesome. glad you're getting so much from this video, Mohammad. Cheers !
The best ever video on VLAN so far. A classic example on how knowledge should be shared to educate others, not in complex way to confuse.
Glad you enjoyed this, Sam. =). Thank you for the kind words.
The best ever VLAN explanation seen on TH-cam. Thank You.
You're welcome =)
I cannot agree more! The network topology animation of the Video really strikes me to understand the logical and physical concept by virtue of Vlan.
It would be fantastic if you have the time to do this with physical devices, two Cisco switches and a firewall/ router and OPNsense or similar!
I watched at least 20 other videos on VLANs. This one finally explained how it works. It makes perfect sense now. Thank you.
You're very welcome, Chris. Glad it makes sense.
Could you do me a favor? Do you mind sharing this video on Linked In, Reddit, Twitter, Facebook, or any other social media you use? As an independent creator, that would be an _enormous_ help, and I would appreciate it _greatly_ .
One of the best explanations I've seen on youtube. Thanks! You're the only one who really goes through the Why/How/When rather than other people only explaining the What.
Thank you, Emmery. I appreciate you saying that. =)
Excellent presentation!!!
I already “knew” everything covered in this video, yet by the end it was like I was really understanding it for the first time.
Well done. 👍
Thanks for the kind words, William. I'm glad you enjoyed the video =)
You have summed up EXACTLY how I feel when watching these videos. Well said, and thank you 'Practical Networking'
This explanation is so simple and yet so concise and to the point. I also love the way you make a review after major section to reinforce the learning.
I'm not new to networking and have been in the industry for a while now but I can't help to admire the way you know how to dissect a complex topic into easy digestible chunks.
Absolutely awesome!
Kinda knew what VLANs were for years but just watching this video it's all clicked first time. I have pretty bad ADHD but your style of teaching worked perfectly!
Glad you enjoyed it, Matt. You might also enjoy my Networking Fundamentals series: th-cam.com/play/PLIFyRwBY_4bRLmKfP1KnZA6rZbRHtxmXi.html
Amazing animations. Showing The physical and logical layers animated at the same time clarifies the concept so well. Thank you
Glad you enjoyed it =)
Just loggged in to post this: this is by far the best explanation of VLAN I found. It is clear, consice, and the animation is perfectly right on point! Great work, and thank you!
I don't usually comment but i have to say, this is probably the best video out there about vlans. No weird analogies. no talking too much, and no useless stories... I also love how you made Native Vlans a piece of cake, literally it only took you about 2 min to make something so clear. However, i do have one question. If the native vlan was set to 50 (in your case), where would the traffic go, just get dropped?
You are literally the best! THanks man!
I've watched several videos on VLANs and this is the most concise and helpful video that I've found. Thank for explaining the purposes of VLANs as well as Trunk and Access Ports. The way you transitioned between sections was also very intuitive and helpful.
Thank you for the kind words =) Glad you enjoyed the video.
This video made me feel so much better about delving deeper into IT. Literally I started smiling at the halfway point out of excitement... thank you. Subscribed and Bell
Happy to hear that, Christopher. Thank you for the kind words!
By far the best explanation i've ever watched related to networking
Thank you, Petrique. I appreciate the kind words =)
Definitely the best introduction to VLANs I've found on TH-cam!!
Thanks Peter. Glad you liked it!
Your instruction and graphics (and animation!) are superb.
If only the N+ study guide publishers leveraged someone like you.
So glad you enjoyed it =) Thank you for the kind words.
Oh my god... this video is so good wth!!! It is so clearly explained and easy to understand.
I'm in a new IT role and I recently had a request to patch two ports and have those two ports added to two different VLANs on our switch. I thought to myself... "Why can't we just allow one port to access multiple VLANs?" Our Network Engineers basically said that was a big nono and this video helped me understand why that is!
=) Thanks for the kind words! I'm glad you were able to understand your Network ENgineer as a result of this video. You might like my Networking Fundamentals videos as well: www.practicalnetworking.net/index/networking-fundamentals-how-data-moves-through-the-internet/
This video is a fantastic presentation of the Vlan concept. I love the crystal clear, concise explanations along with the great animations. Indeed, a work of art.
Thank you for the kind words, Neha =).
Hope you enjoyed that video! If you want to see another video of the Native VLAN in action, check this out: th-cam.com/video/Fmq1E1Qr2W4/w-d-xo.html.
Thanks, video helped me understand vlans.
Thanks for the video! It would be great if you do videos about automotive ethernet
You are a very good presenter
@@randho5150 Glad it helped =)
@@hannahsmith6095 Thank you, Hannah =)
you have literally clarified what other have never been able to and you did it in 10 minutes - thank you so much!! I completely understand now
your videos are the best on the youtube.
@Practical Networking
Thank you for the kind words =)
Amazing explanation on complex topic of VLAN for network newbies. I read the articles and watched the video, consolidated multiple switches into one switch at home and simplified the network.
Glad to hear it. Well done =)
i think this is one of the best video for somwone who has had a problem understanding vlans fro a longtime. thanks
Thank you for saying so, Oneito =).
i love how you make this concept so easy to grasp, much thanks.
You're very welcome!
Inter vlan trunking is possibly my favorite topic in CCNA. That and fhrp and link aggregation . Thank you for all of this. You do an amazing job of illustrating things I didn't know, that my professor assumed I did know.
Hi again Scott. Glad you enjoyed it!
OMG! THANK YOU, THANK YOU, THANK YOU!!!!
I have spent the last 8 hours trying to understand the concept (reading and re-reading the Cisco book) and I swear I thought I was stupid for not getting it. 🤦♀️ Thank you so much, I finally get it!!! 🤗🥳 you are amazing, in case I wasn't clear THANK YOU!!! ✨
Ha! In that case I wish you had found this video eight hours sooner! ;p. Glad you enjoyed the content. Thank you for the kind words. =)
Beautifully done explanation going through all of the important questions quickly without being confusing. The one question I had that you did not specifically address in the video (mismatched Native or Access ports between switches) was thoroughly explained in the article. Answering the two challenge questions on the article further clarified things for me. First time in my near 20 years in IT I actually think I understand VLANs.
Thanks for the kind note, Phillip. Glad it all makes sense now and that you enjoyed the article as well. Cheers, Phillip!
Crystal clear & crisp explanation. Can't thank enough.
Glad you enjoyed it, Laeeq!
Very nice explanation of what a VLAN is. Downloaded this for my personal notes to understand the concept better, thanks!
Glad you enjoyed it!
this is much better than any vlan explain out there! simple yet very comprehensive!
this channel is too good, simple and clear explanations, tysm
Best video on VLAN I have seen in TH-cam. Thank you so much 😊😊
You're very welcome.
Detailed explanation regarding VLAN and I specifically liked the way that you have summarized the presentation. Thank you for sharing this video.
You're welcome =) Glad you enjoyed it!
Currently taking a course, Fundamentals of IT Security (through TestOut) and this video explained these so much better!!! Thank you
You're welcome, Mia =). Please feel free to share this content with your fellow classmates.
The presentation is so good, SO GOOD - it is concise - best 12 mins covers - VLAN, Access/Trunk, Frame, 802.1q, Native VLAN - I have to bookmark this one. :) Thank you !!!
Thank you for the kind words, Feng =). Glad you enjoyed this!
This was very well presented, looking to watch your subnet series next. Thank you for sharing such a great video
Glad you enjoyed it! Looking forward to hearing your thoughts on the Subnetting series as well =)
brilliant, short, concise, great quality.
Thank you, Liam!
This is amazing. Better than most explanations out there. Thanks!
You're very welcome. Thanks for the kind note =)
your videos are the best, the animation is outstanding and helps to remember the concepts.
Thank you. Great way of explaining VLANs.
You're welcome!
The best VLAN explanation for dummies like me! Thank you!!
Glad you enjoyed it, Pitt =). You're not a dummy!
Very good videos.
No fluff, well prepared and presented, and technically correct.
And your use of Wireshark to show the packets with and without the tags makes the concept more tangible.
The magic of 802.1Q (compared to ISL) is the use of the ethertype 0x8100 to let a vlan-aware device know that this is a tagged frame, while still allowing most non-vlan-aware switches to still forward vlan tagged frames, although doing so isn't best practice.
Thank you for taking the time to make these videos, they are very helpful.
Thanks for the kind words, Jon! And the additional details about 802.1q.
Really a brief explanation and simple. Appreciate your efforts to develop such videos. VLAN can't be explained better.
Glad you enjoyed it, Ashwin. =)
First time i ever understood VLANs...tks
You're welcome!
Amazing illustration and graphics, thank you very much...
You're welcome =)
your videos are absolutely amazing! i'm in an intro to networking class and was so confused. i watched this and suddenly had that moment of "oh my god! i get it! i know what's going on!" thank you so much!
Thanks for this video!. I do know about VLANs but wanted to refresh my memory. I did learn few new things!. Thank you for that!.
Happy to help, Flutesiva =) Glad you got something out of the video!
@@PracticalNetworking At 10.11 “When a trunk port is sending a frame - does not belong to the native VLAN - the frame is sent with a tag” Does it strip the vlan id 30 and add vlan 10 ? Or it keeps 30? What does it mean when you say the frame is sent with a tag ? Please explain!
I chewed on the "native vlan" concept for quite a while, as well as "tagged" and "untagged", and this really helped me.
Glad to hear, Jim. Glad you're enjoying the content on my channel =)
glad you are backto having some vids. the packet tracing vid was great. i read the articles of this vlan stuff a while ago. good brushup. my suggestion would be to make a vid on those challenge questions. i got most of them wrong lol
Thanks for the suggestions. Glad you enjoyed the Packet Traveling video =). It was my first TH-cam video and to date is still my most popular.
Thank you for the wonderful video! The explanation was very clear and easy to understand.
You're welcome, Nikolay!
Thanks for this explanation. Very clear and understandable
Such a great video. I've read lots of articles on the web and only this Video made me fully understand. Thank you.
Glad it you now fully understand =).
Could you do me a favor? Do you mind sharing this video on Linked In, Reddit, Facebook, or any other social media you use? As an independent creator, that would be an _enormous_ help, and I would appreciate it _greatly_ .
Simple and clear. THANK YOU!!
You're welcome!
Keep making more videos! Learnt in few mins what i couldnt over many sems of Uni
You are the best teacher ever.
All your videos are great and helpful. Please consider exploring other networking concepts as well. Thanks.
Thanks, Mr. K. Many more video ideas are on the list =)
Really nice explanation to refresh concepts! Thanks!
Glad you enjoyed it =)
wow! Merci! the best easy explanation :) Studying to get my CCNA
De rien! Bonne chance!
This is how conceptual tutorial should be made. For people not expert in this field.
This was so clearly explained. Thank you and kudos.
Glad you enjoyed it, Stephen.
PS: Welcome to the TLS Course =)
Perfection! Thank you so much.
Very well explained! Thank you!
You're welcome =)
Great video! when you get a chance please make a video explaining how to configure a netgear type of VLAN in which you use PVID, untagged, tagged, no untagged and stuff..
Thanks for the very clear explanation 👍👍
An Excellent Video! The Best Explanation Ever!
Wow, thanks!
This was so well explained. I'm definitely going to subscribe so I can see what other goodies you put out.
Thanks for the kind words, rxryanm. And thanks for subscribing =)
Another excellent video. 👍 These guys never fail.
Thanks again!
Very good explanation thanks a lot mate!
Really well done. I wish I'd watched this one first.
Me too! =)
LANTASTIC! Best explanation EVER! Thank you so much!
Glad you enjoyed it =). You're welcome!
I was just diving into container networking. Your explanation of VLAN clicked soo good to me that I kind of understand the motivation behind network virtualization. Your explanation is always crisp and to the point. These excellent visualizations are like icing on the cake. For someone like me without any formal networking background, your work is so easy to digest :)
Any chance you would consider virtual networking as a topic in future :) ? I would happily buy that course. Grokking container/kubernetes networking without proper virtual networking (or networking foundations) in general is next to impossible
very clear and an easy to understand the concept!! keep going ✌️
Thanks, will do!
best video and guide on vlans.
Thanks, actual video on VLANs thats useful.
You're welcome =)
Very helpful and well explained. Thank you!
You're welcome, Ken. Cheers.
Another Great Video Thank u for sharing
awesome explanation and thanks a lot
Thank you very much. Kindly share the videos to understand VXLAN/EVPN.
God bless you sir. this is amazing. very clearly explained.
Fantastic video! Thanks.
You're welcome =)
Excellent .... well done ...
Perfect. Thank you so much!
You're welcome, Antonio. Happy to help =)
The best explaination I have seen so far, thank you.
Thank you, Sepehr! You're welcome!
@@PracticalNetworking i just started an internship at a company that does networking but I do not have any prior knowledge in the field. I straight up watch your entire playlist today at work and now it all makes sense. Really appreciate your videos🙏🏻
@@sepehrrafiei509 That's awesome! That's exactly why this series exists. To give everyone the fundamental networking knowledge they need.
If you don't mind, please tell your coworkers or fellow interns about this series. Thank you =)
@@PracticalNetworking will do, thank you.
This was awesome!! Thank you so much.
You're welcome, Navishkar.
Absolutely superb sir.steve from uk
Hi Steve, glad you enjoyed it!
Cheers! great explanation
Glad you enjoyed it !
Great video. I hope you discuss how Routers exchange routing information like OSPF(Link State Protocol) & RIPv.2(Distance Vector Protocol)& EIGRP(DV & LS Protocol). Thank you.
Thanks for the suggestion =). I've written three articles on EIGRP, those might help in the mean time.
www.practicalnetworking.net/stand-alone/eigrp-terminology/
www.practicalnetworking.net/stand-alone/eigrp-metric/
www.practicalnetworking.net/stand-alone/eigrp-feasibility-condition/
your videos are the bomb. I learn so much from them. Could you combine this presentation with the "how packets travel througn a network" to see what happens throughout the whole process with tagging and such?
If your comment gets enough likes, I will consider adding a switch with trunks to a packet traveling type illustration.
Glad you've enjoyed the content otherwise =)
This is a seriously good video.
Thank you Dylan, glad you enjoyed it.
Thankyou sir......with lots of love from INDIA
You're welcome =)
Wicked video!!! Thanks. I've subscribed!
Fantastic =) Thank you!
Great Video, it was super helpful with studying, the only note ill say is the audio seemed low on my end and I had my headphones on max.
Glad you enjoyed it! Thank you for the feedback about the audio. I just recently changed the way I do my audio engineering and that might be the culprit. It will be better in the next video!
This is very clear explanation. Can you also add series for VXLAN please
good explanation of how and when tagging happens and Native VLAN (PVID). Could have taken it one step further to show how the 2 routers can be one physical router but I guess that's the next layer.
Thanks Dominic.
Agreed. I wanted to keep this video just focused on VLANs / Switches. I do discuss Routers and VLANs in this article:
www.practicalnetworking.net/stand-alone/routing-between-vlans/
great video!
excellent explanation.
Thank you, Fausto =)
Superb explanation buddy ❤️
Thank you, Srivatsan. Glad you enjoyed it =)
Straight forward. Filled in a couple of gaps for me. But after the first couple times my brain heard ‘Villain’ instead of VLAN haha!
I think that means its sinking in ;) At the very least it will help you remember everything if you get a slight chuckle when thinking about VLANs in the future.
Thank you for sharing, keep spirit👌🏻
You're welcome!