From the course: Deploying Layer 2 Switching for Cisco Networks by Pearson
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VLANs - Cisco Tutorial
From the course: Deploying Layer 2 Switching for Cisco Networks by Pearson
VLANs
In this lesson, I want to talk to you about virtual LANs, or VLANs for short. Now, in order to properly describe why we actually have the concept of VLANs, let's just kind of roll back to some of the previous topics we've talked about. So, we talked about how broadcast traffic is flooded throughout a Layer 2 domain. So, here we have a traffic from PCA and it's poured out of all the ports from Switch 2. Now, one of the things worth while pointing out is the traffic does not progress any further at R1. It simply does not go past that interface onto the 192.168.2 network, and again, that's because broadcast traffic does not traverse Layer 3 domains. So what we end up having is we end up with a broadcast domain for all the devices as as far as PCA, PCB, PCC, and the link to R1. Now the same thing could be said with what we have on the 192.168.2 network, where that is a broadcast domain. And so the same scenario would happen on the right. If PCF was to send broadcast traffic up to switch…
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