104
Chapter 3
VLANs
F I G U R E 3 . 2
Physical LANs connected to a router
Each network is attached to the router, and each network has its own log-
ical network number. Each node attached to a particular physical network
must match that network number to be able to communicate on the inter-
network. Now let's look at what a switch accomplishes. Figure 3.3 shows
how switches remove the physical boundary.
F I G U R E 3 . 3
Switches remove the physical boundary.
Net = A
Net = C
Net = B
Net = D
E0
E3
E1
E2
VLAN A
VLAN B
VLAN C
VLAN D
VLAN A
VLAN B
VLAN C
VLAN D
VLAN A
VLAN B
VLAN C
VLAN D
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