Refer to the exhibit. What can be determined about the interfaces of the Main_Campus router from the output shown?

Question

Exhibit

Options

• AThe LAN interfaces are configured on different subnets.
• BInterface FastEthernet 0/0 is configured as a trunk.
• CThe Layer 2 protocol of interface Serial 0/1 is NOT operational.
• DThe router is a modular router with five FastEthernet interfaces.
• EInterface FastEthernet 0/0 is administratively deactivated.

• A
  3% (1)
• B
  75% (24)
• C
  13% (4)
• D
  3% (1)
• E
  6% (2)

Explanation

The 'show ip interface brief' or 'show interfaces' output for the Main_Campus router reveals subinterfaces under FastEthernet 0/0 (e.g., Fa0/0.1, Fa0/0.2) with 802.1Q VLAN encapsulation configured. The presence of multiple subinterfaces on a single physical interface is the hallmark of a router-on-a-stick configuration, which requires the physical interface to be operating as an 802.1Q trunk. Therefore, FastEthernet 0/0 is configured as a trunk. A is incorrect: subinterfaces on the same physical interface serve different VLANs, not different physical subnets in the traditional sense. C is incorrect: Serial 0/1 shows as up/up. D is incorrect: the subinterfaces are logical, not additional physical ports. E is incorrect: the interface is active, not administratively shut down.

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