VLANs Explained | Cisco CCNA 200-301

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VLAN stands for Virtual Local Area Network.
Using VLANs we can virtually separate our LANs into smaller chunks.
Why would we want to do that? There are a few reasons why we might want to use VLANs. One of the main reasons is something we’ve already spoken about, and that is broadcast traffic.
Very quickly, broadcast traffic came start to slow down our networks and devices. Once our networks start to grow, we need a way to manage all of this traffic.
VLANs give us the benefits of physically separating network, but with the added bonus of being able to do this virtually. The traffic still behaves in the same way as if it was physically split.
VLANs make it very easy to control broadcast domains. It's also scalable, we don’t need new equipment or to re-cable everything every time we want to make a change.
Out of the box, cisco, and most over switches, have a default VLAN called VLAN 1. Every interface is assigned the default VLAN.
From here, we can start to make our own VLANs and split up our switch. You can add up to 4094. This is the maximum number of supported VLANs.
VLANs aren’t restricted to just one switch. We can have the same VLANs across multiple switches. This makes VLANs very versatile and scalable.
There are two types of ports on a switch, an access port and a trunk port. An access port is designed for endpoint devices to access the network. Such as computers, laptops etc.
A trunk port can send traffic from different VLANs. They’re are used to send traffic between networking devices.
802.1q tags are added to frames when they are sent over a trunk port. 802.1q is the IEEE standard. It can also be called DOT1q. This tag is 4 bytes and contains a few bits of information.
TPID or Tag protocol Identifier - this is used to identify the frame as an 802.1q tagged frame. It could also be ISL but this it’s rarely used today.
TCI or Tag Control Information - This contains 3 bits of information, the priority, CFI, which is a format indicator, and most importantly, the VLAN ID.
The tag field is then read and removed by the receiving switch.
A native VLAN is configured per trunk interface. It’s the VLAN that switch assumes the frame is on if there is no tag. By default, the native VLAN is VLAN 1. Tags are not added to frames that belong to the native VLAN.
#ccna #cisco #networking

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Thanks Brian. Really appreciate it. Only 494,690 to go 🤣

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Thank you! Great to hear the videos are helping. Good luck with the N+ and when you're ready, come back for the CCNA Course 😁

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wrr, no such thing as slow down or trafficx etc, boradcasxinx, can broadcasx infix nmw, doesnt matter

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[@khiderglal8245]

I'm familiar with VLANs and I know how to configure them. but it is the first time to understanding them like this. thnx from my heart. the way of explaining things through scenarios is amazing.

[@Certbros]

Thank you Khider! 🙏 Making this video was a lot of fun so I'm glad to hear it helped you get an understanding of VLANs!

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It only taken me a short few hrs to watch half the entire CCNA Playlist. Even stopped to read a few comments and answer some questions. So I now know I can watch the entire playlist in an evening and will do so again this weekend in preparation for my CCNA exam next week. Thanks CertBros for the curated compiled list to make a speed review watch list.

[@MrFrankenstock]

Really like your smooth explanation of native VLANs. It definitely drove the concept home for me - thank you!!

[@petebowker9507]

Incredible - really struggled understanding tagged/untagged ports on VLAN's for ages until I found this vid, thanks! :)

[@vesder819]

Thanks, love the way this was explained. Installed OpenWRT on my router so I could use vlans. Just by watching this video configuring my router with a vlan and tags suddenly became easy, while before I didn't understand any of it.

[@decentcomment9447]

When is the full course coming because this is without a doubt the best collection of videos on ccna I’ve have been able to find. You somehow manage to explain everything in a way that just makes sense and then just when I have a question in my head the next part is you answering the question! Amazing work! I hope the full course comes soon

[@tadipathrisai8391]

quality of these videos extremely great ..the concepts behind it and the effort put in, surely deserves appropriations ...

[@ImSuperGoodAtDancing]

This is by far the best Video on VLANS or Networking Concepts that i have ever seen. Trust me when i tell you that i have searched HIGH... and i have searched LOW... My friends this is worth your time, and definitely your support! Thank you for putting this out there! p.s. me llamo SURE SHOT!!

[@Certbros]

Thank you for the great comment! I had a lot of fun making this one! Glad you liked it.

[@user-pk9mg2lr4e]

This video literally has all the answers to the questions I had. Great stuff.

[@dencam]

Simple yet well explained. I like your approach.

[@Certbros]

Thanks Dennis. Glad you liked it!

[@DG-mo1zf]

Great video. Im glad I found this channel!

[@Certbros]

Thanks. Glad you're here! 👍

[@TheRonnieGabriel]

Finally understood what Native VLANs. Thank you so very much.

[@emsheeranstudio3459]

This video deserved 1million views I hope you will get,, best explaining ever ❤️

[@Certbros]

Wow, thanks!! Really appreciate the comment. Bring on 1M views! 👌

[@sandoxs]

this is the first time I understood native vlan, ty so much!

[@TheElevenBravo]

Thank you so much for putting this awesome video together! Much appreciated, pal! Bless you!

[@PaulOPeezy]

Very good video. Best explanation I’ve seen so far

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Amazing - is there anything better than this show me !!! I couldn't find one - Kudos @Certbros.

[@Certbros]

Haha Thanks!!! Great to hear.

[@michaelbryant3643]

I was so mad at school when I couldn’t understand this lol you helped a lot.

[@ot7671]

Now I understand VLANS better. Much appreciated.

[@aruizsilva]

Well done! Very nice content as usual. Really appreciate your work. Thanks!

[@Certbros]

Thank you Antonio! Glad you liked it 👍

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Man the intro always gets me hyped

[@jamesdouglas8889]

amazing , well explained even better than reading. wonderful job

[@Don-Carillo]

Love these. Keep em coming

[@Certbros]

Thanks!

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one of the best channels ever!

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Thank you Chandra!

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My friend recommended me this and i am not disappointed

[@ParanormalCraftFR]

Great as always !

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Thanks!

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is so clear explanation! great video!! thanks !!

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high quality material. keep it up!

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Thank you Mike! Really appreciate the comment!

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[@Certbros]

Thanks man, great to hear!

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thank you so much for such a video

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Thank you for the kind words Binay! 🙏 Nepal looks incredibly beautiful!

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Yeah it is. I follow Jeremy IT Labs on KZbin. Did his full CCNA Course on Udemy online. But I also like CertBros animated vids. So I’m currently watching his entire 31 video CCNA playlist as a speed review as I have my CCNA Cert exam next week.

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Along your series usually people starts to love Networking more, I on the other hand am starting to love After Effects more and more, amazing videos!

[@Certbros]

Haha! Thank you Shrief! Great to hear because these take way too long to make 😂

[@vaxer52]

distinctively helpful...for beginners like me....thanks a lot

[@dejanz4912]

I like it. Very good explanation of VLANs.

[@Certbros]

Great to hear you liked the video! Thanks for the comment 👍

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Quality, thank you

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Thank you so much mate

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Your videos are great!

[@Certbros]

Glad you like them!

[@victoriaramirez6867]

Excellent video and explanation

[@ashleycarnes1577]

Thank you for this video !!!!!!

[@Certbros]

No problem!

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Great video, thanks!

[@Certbros]

Thanks Jose. Glad you liked it!

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Your explanation is very helpful for me to be able to explain more easily to my students. greetings from Indonesia. Thank you

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Thanks Abdu! Great to hear they are helping. All the best to you and your students 👍

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Thank you so much

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Awesome 👏 like ever 💙

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Thanks Haron!

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Thank you

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Thank you for sharing!! The video is loaded with tons of efforts to make it easy to comprehend!!!!!

[@feiwoza]

Thank you !

[@Certbros]

You're welcome!

[@sleekspeed22]

Great videos... much still goes over my head. In one of your video you mentioned using vlans to separate different devices bease on trust level... highest level for PC you have and lowest for noname bulbs etc... Does that mean you are assigning IP statically for each device? I'm trying to figure out how I should do this. And expand on it to limit access to some devices if access remotely via VPN... I'm using an old 3com 4500G Switch.

[@rajendrai2680]

Thank you Sir, I am waiting this type of explanation classes.

[@Certbros]

Thanks Rajendra. Happy to help!

[@seetsamolapo5600]

- creating/separating broadcast domains; reduced broadcast congestions by using interfaces

[@shaharafat9290]

This are the best tutorials so far. But did you cover full CCNA course 200-301?

[@Certbros]

Thanks Shah! I am currently making a full course (link in the description) but have plenty more videos coming for KZbin.

[@lysaali50]

fun little story to remember VLANs imagine you're hosting a party in your room in your family apartment, and you don't want your parents to find out how many guests are invited so you open up your window and let people climb up for security your best friend acts as the bouncer and checks the IDs XD

[@Dextermorga]

Finally I know what exactly trunk port is 😂 👍

[@gorilla_with_jetpack4102]

Subscribed.

[@gasergaser8629]

if it broadcast packets on all ports besides one that it received packet from then thats not switch but an hub but switch will act as hub until it learn mac addresses

[@elionaidgranados1005]

the way you explained couldnt be more crystal clear

[@luiscabrera-gm2bu]

nice video

[@George-nq2mx]

Thanks for such an amazing video, but what does it mean when we have one vlan with one ip address or one vlan with multiple Ip addresses?

[@thapelomphahlele9500]

Great content

[@Certbros]

Thank you 👍

[@Certbros]

Thank you!

[@leothalion3983]

Yes!!!!

[@sirusvirtus5885]

🤘👍, thanks

[@Certbros]

No problem 👍

[@jordanhenshaw]

Oh I can make this problem a hell of a lot simpler for you. Just delete the entire HR department. That's 20 less ports for you to figure out.

[@musamnguni510]

🤭

[@heroclix0rz]

Small note: i think saying "the TCI contains 3 bits of information" is misleading, as "bit" means something. Had to double check elsewhere, but it's actually 16 bits.

[@AUBCodeII]

9:56 in this example, should the VLAN of the computer connected to the interface assigned to VLAN 20 also be changed to 20 in order for it to work? How do you do that?

[@SammySey813]

i got this!

[@Certbros]

Yeah you do! 🔥

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@Cert Bros,,why didn't you upload full CCNA course,,, please upload full CCNA course on KZbin bro

[@ardentdfender4116]

His full CCNA Course is in his playlist if you check.

[@angelikavillanueva]

Great Video and i learn a lot. can i use your video to my presentation? if its okay? Thank you

[@Certbros]

Thanks Angelika! Great to hear the video helped. If your presentation is for personal use then go for it 😁

[@gregores5107]

How does a router split the LAN's?

[@orkovas1827]

hey, a little question in 3:39 you show a lan network seperated by VLANS and every department has 20 pc's theoretically. but in reality if i wanted to have 3 departments of 20 pc's each wouldn't it require an extra switch?(assuming i'm using a 48 port switch)

[@hanisirfan]

Hardware wise, you do indeed need another switch to carter the total number of PCs. You can trunk the switches as mentioned in the video to allow the same VLAN traffic on different switches.

[@guycohen4403]

what do i do if i want more then 4094 vlans? how can I creat more

[@MaxUgly]

I am confused... By "hub" is the video referring to a "dumb switch" in the middle?

[@tomleyssens3372]

what if there is a router in the network?

[@abcpsc]

So what if devices on different vlan want to communicate? Would they still be able to do it as if they are on the same network? Or if there any special settings to make it happen?

[@ardentdfender4116]

They can communicate. A communication frame gets sent for example on VLAN 10 from your PC via the Switch and it get sent to the Router. At the Router it repackage the communication frame from VLAN 10 and then sends it back down the network on VLAN 30 to my PC on VLAN 30. The Router is who decides for inter VLAN Traffic as a L3 - Layer 3 device. Some Switches or more advanced Switches are Multilayer Switches as L3 and have the capability to route inter VLAN Traffic.

[@theerthaprasad5342]

V helping sir

[@Certbros]

Thank you!

[@amrnrsyada]

I need DNS explanation TT, thank you

[@Certbros]

It's on my to-do list 💯

[@yomeroelalex]

The TCI is 16 bits long. The rest of the video is really usefull.

[@Certbros]

I meant it contains 3 separate bits of information, not 3 bits in length. I can see the confusion 🤣 Glad you liked the video.

[@Rhand007]

So it is best practice to have all connected Switches in your environment set to the same native VLAN, I assume?

[@ardentdfender4116]

You can have different VLANS on different Switches as a way to split up the LAN and depending the route to the Router. However, depending on the LAN Topology with Switches, traffic can be permitted via configuration on another Switch for a VLAN. It depends on how the LAN is configured why you configure that. For inter VLAN traffic that VLAN Data Frame has to first travel to the Router which then repackage the Data Frame and then sends it back on the correct VLAN to the destination it was destined for.

[@mustikasari5571]

anda bisa menambahkan animasi kartun pada video anda. terima kasih

[@phx4closureman]

1:27 *add a WHAT ?!?!?!?!* 😆

[@hecta14]

How does the switch know there has been a native vlan mismatch if the frame is untagged? Is it because the frame has not been forwarded on the second switch? If so, would the message pop up if there was a pc with vlan 20 connected to the same switch?

[@Certbros]

Great question! The switches use another protocol for this. For example CDP will tell the neighbour switch its native vlan.

[@hecta14]

@@Certbros Thanks, cheers!