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…

Question

Exhibit

Options

• AUse a hub to connect the four VLANs with a Fast Ethernet interface on the router.
• BAdd a second router to handle the VLAN traffic.
• CAdd two more Fast Ethernet interfaces.
• DImplement a router-on-a-stick configuration.

• A
  6% (2)
• B
  16% (5)
• C
  6% (2)
• D
  72% (23)

Explanation

Router-on-a-stick uses a single physical router interface connected to a switch trunk port. The router interface is divided into logical subinterfaces (e.g., fa0/0.10, fa0/0.20, etc.), each configured with 802.1Q encapsulation for a specific VLAN. This allows one physical interface to route traffic between all four VLANs, conserving physical ports. A is incorrect: using a hub would create a collision domain and significantly degrade performance. B is incorrect: adding a second router uses more hardware without solving the interface shortage efficiently. C is incorrect: adding two more FastEthernet interfaces would work but uses more physical ports than necessary and is not the most resource-efficient solution.

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