VLANs Explained | Cisco CCNA 200-301
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- Опубліковано 1 лип 2024
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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
The quality of these videos, the concepts behind it and the effort put in, surely deserves atleast 500k views
Thanks Brian. Really appreciate it. Only 494,690 to go 🤣
@@Certbros after some time you will bros
@@Certbros already on halfway to 500k😉
by next year😁
You are crushing it with these videos. So simple and clear. Well taught and you make everything just "click". Excellent job. Keep making vids like these and you're channel is going to explode > 1 million subs! Cheers
The quality of the content you guys serve cannot be quantified. It’s a goldmine, and it’s really helping a lot of people. Thank you so much for the effort put into this ❤️
You guys are awesome! I've learned more from your videos than the whole Cisco Netacad program I had to use through school.
Man, your explanation of networking concepts are so, soooo awesome. Thank you!!
The videos from cetbros are really tremendous. The most of the topics the way you explained was awesome. The people will love and start learning who doesn't have idea or interest in Networking !!! . We are really awaiting for more tech videos !!! Appreciate your great works
Really like your smooth explanation of native VLANs. It definitely drove the concept home for me - thank you!!
BRUH!!! I cant tell you the amount of notes I have on this stuff and I still never understood them am so grateful for finding your vids really, I have just registered on your website I cant wait for your CCNA COURSE am now prepping for N+
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 😁
wrr, no such thing as slow down or trafficx etc, boradcasxinx, can broadcasx infix nmw, doesnt matter
"did you feel that?" "nope"
Brilliant.
Incredible - really struggled understanding tagged/untagged ports on VLAN's for ages until I found this vid, thanks! :)
I just discovered these videos, no other educational channels hits spot on like you, you have my eternal gratitude! ❤️
Thank you! Glad to have you here 🙏
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.
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.
Finally understood what Native VLANs. Thank you so very much.
quality of these videos extremely great ..the concepts behind it and the effort put in, surely deserves appropriations ...
This video literally has all the answers to the questions I had. Great stuff.
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!!
Thank you for the great comment! I had a lot of fun making this one! Glad you liked it.
Now I understand VLANS better. Much appreciated.
Simple yet well explained.
I like your approach.
Thanks Dennis. Glad you liked it!
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
Thank you so much for putting this awesome video together! Much appreciated, pal! Bless you!
this is the first time I understood native vlan, ty so much!
Great video. Im glad I found this channel!
Thanks. Glad you're here! 👍
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.
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!
Very good video. Best explanation I’ve seen so far
This video deserved 1million views I hope you will get,, best explaining ever ❤️
Wow, thanks!! Really appreciate the comment. Bring on 1M views! 👌
Amazing - is there anything better than this show me !!!
I couldn't find one - Kudos @Certbros.
Haha Thanks!!! Great to hear.
amazing , well explained even better than reading. wonderful job
Man the intro always gets me hyped
Well done! Very nice content as usual. Really appreciate your work. Thanks!
Thank you Antonio! Glad you liked it 👍
Thank you very much! This was a life-saver!
I was so mad at school when I couldn’t understand this lol you helped a lot.
My friend recommended me this and i am not disappointed
Best ever concept building bunch of videos
JUST imagine the teachers wouldve teached like this guy...
Amazing Work ☝️
Very well explained! Thanks a lot!!!
is so clear explanation! great video!! thanks !!
This is helping me so much! thank you
All your Videos are excellent ....No need to read books ..Just we chack check these and revise the knowledge we have ...Good work ...want to see many more Videos ..
one of the best channels ever!
Thanks Layth! Really appreciate it 👍
Great great content. Would love to see more videos on Cloud topics!
Love these. Keep em coming
Thanks!
Your videos fun to watch. Thanks for your great videos. You deserve more subs
Thank you Chandra!
high quality material. keep it up!
distinctively helpful...for beginners like me....thanks a lot
Thank you! Simply you are amazing!
Thanks Jacek!
Great as always !
Thanks!
Oh my freaking GD these vids are the best!
Thank you Mike! Really appreciate the comment!
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!
Haha! Thank you Shrief! Great to hear because these take way too long to make 😂
thank you so much for such a video
I like it. Very good explanation of VLANs.
Great to hear you liked the video! Thanks for the comment 👍
Ur saving my time bro....awesome video.. expecting more videos related to networking concepts!!
Thanks man, great to hear!
you seriously do have great teaching skills your every video have crystal clear explanation...love and respect from nepal as well...looking for more videos in next few days.
Thank you for the kind words Binay! 🙏 Nepal looks incredibly beautiful!
Your explanation is very helpful for me to be able to explain more easily to my students. greetings from Indonesia. Thank you
Thanks Abdu! Great to hear they are helping. All the best to you and your students 👍
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.
Quality, thank you
Thank you for sharing!!
The video is loaded with tons of efforts to make it easy to comprehend!!!!!
Excellent video and explanation
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.
🤭
This is a great video ❤
Thank you so much mate
Your videos are great!
Glad you like them!
Thank you Sir, I am waiting this type of explanation classes.
Thanks Rajendra. Happy to help!
This and Jeremy IT lab are great resources for CCNA.
Yeah it is. I follow Jeremy IT Labs on UA-cam. 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.
Great video, thanks!
Thanks Jose. Glad you liked it!
Thank you for this video !!!!!!
No problem!
- creating/separating broadcast domains; reduced broadcast congestions by using interfaces
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
This are the best tutorials so far. But did you cover full CCNA course 200-301?
Thanks Shah! I am currently making a full course (link in the description) but have plenty more videos coming for UA-cam.
Thank you so much
Finally I know what exactly trunk port is 😂 👍
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?
Awesome 👏 like ever 💙
Thanks Haron!
Thank you
Thank you !
You're welcome!
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?
Subscribed.
the way you explained couldnt be more crystal clear
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)
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.
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
Great content
Thank you 👍
Thank you!
Yes!!!!
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?
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.
what do i do if i want more then 4094 vlans?
how can I creat more
Great Video and i learn a lot. can i use your video to my presentation? if its okay? Thank you
Thanks Angelika! Great to hear the video helped. If your presentation is for personal use then go for it 😁
I am confused... By "hub" is the video referring to a "dumb switch" in the middle?
How does a router split the LAN's?
nice video
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.
🤘👍, thanks
No problem 👍
@Cert Bros,,why didn't you upload full CCNA course,,, please upload full CCNA course on UA-cam bro
His full CCNA Course is in his playlist if you check.
what if there is a router in the network?
I need DNS explanation TT, thank you
It's on my to-do list 💯
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?
Great question! The switches use another protocol for this. For example CDP will tell the neighbour switch its native vlan.
@@Certbros Thanks, cheers!
So it is best practice to have all connected Switches in your environment set to the same native VLAN, I assume?
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.
I have a question guys, I'm a Newbie in the field of Networking. How could you add up to 4094 VLANs in a switch which probably has just 24 ports @ 4:18? Could you please clear that out to me? Thanks. Loveeee your videos by the way
Some interfaces can be configured to carry multiple VLANS. And some interfaces can also be configured as “Trunks” Ports connected switch to Switch where many VLANS are carried like an expressway over the Trunk Port. Just think of a multiple lane expressway carrying lots of traffic with each car lane permitted to carry a different VLAN with the Trunking feature. You can also have a large LAN with many switches in the LAN and on each the switch they have configured different VLANS that may be different to what’s on other switches. At times some those VLANS traffic need permit to travel in between different switches on specific switch ports. That don’t quite explain how exactly one uses up 4094 VLANS, but that’s the best I can do right now with my knowledge. I’m supposed to be taking my CCNA Cert Exam next week.
The TCI is 16 bits long. The rest of the video is really usefull.
I meant it contains 3 separate bits of information, not 3 bits in length. I can see the confusion 🤣 Glad you liked the video.
And I though Tony Stark was my favorite superhero … you are my new #1
I’ve been looking at too much info and this is the first time this has been explained where it finally clicked. Fantastic job
i got this!
Yeah you do! 🔥
how can i get your full ccna course portal
Hi Neil, if you register your interest in the description you will be sent the pre-launch link.