Session #2 - Layer 2 Switching
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07/21/2003
Session #2 - Layer 2 Switching
43
07/21/2003
Virtual
LAN’s
Virtual LAN’s and
Broadcast Domains
¨Layer
2 Switches typically break up collision domains but not broadcast domains
¨This
means broadcast and multicast traffic must be flooded out all ports of the switch, in some cases creating unnecessary traffic
¨Virtual LAN’s (VLAN’s) are the exceptions to the
rule. VLAN’s break up broadcast domains at Layer 2