THREE Reasons to Create a VLAN

In my experience as a network engineer, I have seen MANY different VLAN designs. Unfortunately, most engineers are left to their own guesswork to determine VLAN design. In my opinion, it’s best to keep it simple: there are only THREE reasons you would create a VLAN that I discuss in this video.
01:55 Security
04:38 Scalability
07:15 Treatment
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[@AaronAnderson323]

Great explanation. There is a white box blocking some of your illustrations in the upper right hand corner. 8:33 for example.

[@AseDeliri]

Amazing. I'm a software engineer and I've never messed with networking stuff. No one explains anything. They just talk. Put that on your VLAN x or y. You actually explain the logic behind it. Thank you sir.

[@manojmemane4974]

His awesomeness in teaching the technology is increasing day by day, that's why he is the best, Thanks Jeremy

[@konradpietrucha1530]

Oh, you're good man! And I'm not talking about your technical skills cause that obvious. I'm talking about the presentation / teaching skills. The way you convey a message is so clear and elegant. This plus fun factor. Brilliant!

[@maverickather]

Jeremy ..I wish CBT has more ppl like u , it wud hve nvr left behind in the race..! U r incredible ..It looks like I am in the live IT training session, rather than watching recorded vdo . Ur videos are the most interactive and energetic in tech tutorial segments.!!!!

[@cyberapril-j]

gotta rewatch this. your keepingitsimple video posts here are really good for those whos reviewing for their ccna and want to have some deep level of understanding. really great Jeremy!! thanks for this

[@JeDeXxRioProKing]

i want to keep what i want to say SIMPLE @Jeremy You are the best

[@ThomasTomchak]

Love this simple but concise video. I think even experienced network admins could watch this as a refresher to refocus on what the real benefit of vlans is.

[@superpoon16]

Thank you nice video easy to understand and fun to watch. Please make more.

[@AlexEntirely]

Your delivery is Bruce Lee. Sharp, fast, smooooth :) You are like water my friend :D

[@jmhm17]

Im still a strong supporter of limiting broadcast domain size. Ive seen the performance benefits. Im talking extremes tho like 1 vlan for an entire campus. Common practice is still to segment per an IDF to limit broadcast domains and route per location (IDF).

[@balletriverdance1058]

Thanks for the great video 👍🏻

[@aboutit-coursesandtutorial561]

Hey Jeremy. Excellent video, as always. Leaning networking is always fun and much easier when learning from your videos. One pointer if you are interested. If you change the timestamps in the description to something like this you will also get nice chapters in the seek bar of the video: 00:00 Introduction 01:55 Security 04:38 Scalability 07:15 Treatment The 00:00 part is very important. And the 0 for minutes between 1 and 9 is important for it to work.

[@Viatto]

Excellent - thank you for the feedback!

[@chetanchaudhari1011]

Hello Jeremy I have question on which layer BGP works.. Could you please make video on it.. I will be thankful.. expecting your acknowledgement

[@markchristopher2509]

Question: aside from limiting the broadcast network, once routing is in place between VLANs how exactly does having VLANs increase security?

[@Udanoob]

What you can do is install antivirus on each end device, something like Cisco AMP, and in AMP you can segment the PC's into the same groups as you did with the VLANs. So you could have Finance on one VLAN and Marketing on a different VLAN, and say a PC in Marketing got infected with a virus. With Cisco AMP you could quarantine just that one computer, or if it's really bad you can quarantine the entire department/VLAN. This would prevent the virus from spreading to other departments/VLANs. Technically it's not the VLAN that's providing the security, Cisco AMP is doing that, but segmenting the PC's in AMP based on VLANs can reduce the impact.

[@rashaelrabiae2214]

Great video.Thank you

[@MikeTaylor-sw4ro]

Not sure if anyone has mentioned this, but you can use a website translator to avoid content filtering of all sorts. We used to do this in school to browse some questionable content ;)

[@binsitt]

Quite a nugget! :) Thank you!!!

[@Completely_Incomplete]

THANK YOU!!!

[@drsquirrel00]

vlan numbers matching room numbers! OMG BRB. (You could argue this would work in a situation where you want them isolated, rentals, conference, multi tenant etc).

[@Vinoth193155]

Love you Jeremy 😊

[@goruby2]

Ok this is Cisco related but not on topic. I have a question. I have multiple working computers that will connect to the domain, and all of the share drives on some vlans but not on the vlan I need them on. Jeremy do you have a possible answer or solution?

[@shawn4626]

Great stuff here Jeremy thank you

[@Eideen]

I would add 2 more reasons, that we use at work. Routing and isolation When you have network topology with link redundancy, or many campus it ill advised to spanned vlans cross buildings. When you have a network consisting of less than ideal equipment (Internet of shit) where network stack was not the primary focus, they can be very sensitive to and extra traffic. so it better to make smaller Vlans to isolate broadcast domains.

[@88Rickster88]

I listen to other videos and they list amongst those three reason listed as a performance reason (the same way as Torstein described - less broadcasts). Is this valid in today’s world of IT hardware?

[@dillonwalker8221]

Thanks Jezza great video

[@elnelly16]

Awesome, I am so glad !!

[@mariembuenaventura1278]

Thank you sir!

[@tshewangphuntsho1363]

You should create more abstract videos

[@guywithacamera2301]

You’re an absolute savage thank you

[@Torcheban]

One VLAN to rule them all!

[@justinknash]

How do you do cross vlan communication then? I.E. accounting needs to access the server on a different vlan.

[@ryanmission]

Presumably a router, or a firewall that's performing routing.

[@Udanoob]

You're describing inter-vlan routing, basically routing packets between vlans. This is common practice.

[@jonnyzeeee]

Thanks for putting this together. You obviously know your stuff, but I just have to say that your handwritten diagrams don't work for me. Mostly because your handwriting is very hard to read. Take 6:23 for example, this looks like scribble. Please take this as constructive criticism and know that your efforts are appreciated.

[@kristopherleslie8343]

I agree

[@kristopherleslie8343]

Security and VLAN shouldn’t be used in same sentence