Discussion
What does a VLAN do?
Answer: C
Correct answer: Breaks up broadcast domains in a layer 2 switch internetwork.
A switch by itself puts every port in one broadcast domain. Assigning ports to different VLANs divides them into separate broadcast domains within the same physical switch, so a broadcast in one VLAN is never seen in another, and traffic between VLANs requires a router or a layer 3 switch. Each port already has its own collision domain, VLAN or not; that is what makes it a switch.
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