VLANs Explained | Cisco CCNA 200-301
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Published 2020-10-06
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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
All Comments (21)
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Man, your explanation of networking concepts are so, soooo awesome. Thank you!!
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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.
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Really like your smooth explanation of native VLANs. It definitely drove the concept home for me - thank you!!
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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
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Incredible - really struggled understanding tagged/untagged ports on VLAN's for ages until I found this vid, thanks! :)
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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.
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quality of these videos extremely great ..the concepts behind it and the effort put in, surely deserves appropriations ...
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Finally understood what Native VLANs. Thank you so very much.
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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. <3 <3
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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!!
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Now I understand VLANS better. Much appreciated.
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This video literally has all the answers to the questions I had. Great stuff.
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