Multiple choice

Refer to the exhibit. Which of the following two statements are true about the operation of the interfaces?

  1. Incoming traffic with VLAN ID 0 is processed by interface fa0/0.

  2. Incoming traffic that has a VLAN ID of 2 is processed by subinterface fa0/0.2.

  3. Both subinterfaces remain up with line protocol up, even if fa0/0 line protocol is down.

  4. Subinterfaces use unique MAC addresses by adding the 802.1Q VLAN ID to the hardware address.

  5. Traffic inbound on this router is processed by different subinterfaces, depending on the VLAN from which the traffic originated.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Router-on-a-stick uses subinterfaces with 802.1Q encapsulation to route between VLANs. Each subinterface is configured with an encapsulation dot1q command. When traffic arrives on the physical interface with a VLAN tag, the router directs it to the matching subinterface based on that VLAN ID. Subinterface fa0/0.2 handles VLAN 2 traffic. The physical interface fa0/0 itself doesn't process the VLAN-tagged traffic - the subinterfaces do based on VLAN tags.

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