A router has two Fast Ethernet interfaces and needs to connect to four VLANs in the local
network. How can you accomplish this task, using the fewest physical interfaces and without
decreasing network performance?
A.
Use a hub to connect the four VLANS with a Fast Ethernet interface on the router.
B.
Add a second router to handle the VLAN traffic.
C.
Add two more Fast Ethernet interfaces.
D.
Implement a router-on-a-stick configuration.
D. A “Router on a stick” is when you’re passing more than 1 VLAN down a single physical wire. Although two computers can talk on that same wire, if they aren’t in the same VLAN, they’ll still have to go all the way up to the router to get their packets routed successfully.
On the router CLI, you’ll see interfaces with something like gi4/2.20 and gi4/2.30 to represent a single port that is communicating on VLAN 20 and VLAN 30.
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