Refer to the exhibit. HostA cannot ping HostB. Assuming routing is properly configured, what could be the cause of this problem?

Question

Options

• AHostA is not on the same subnet as its default gateway.
• BThe address of SwitchA is a subnet address.
• CThe Fa0/0 interface on RouterA is on a subnet that can't be used.
• DThe serial interfaces of the routers are not on the same subnet.
• EThe Fa0/0 interface on RouterB is using a broadcast address.

• B
  4% (1)
• C
  16% (4)
• D
  72% (18)
• E
  8% (2)

Explanation

For two routers to forward packets between each other over a serial WAN link, both serial interfaces must reside on the same IP subnet. If RouterA's serial interface is on, for example, 192.168.1.1/30 and RouterB's serial interface is on 192.168.2.1/30, the routers cannot establish Layer 3 connectivity between them, breaking the end-to-end path even when routing protocols are configured. Choices A and E would create local subnet issues but are stated as not being the problem here. Choice B (switch using a subnet address) and Choice C (Fa0/0 on an unusable subnet) are not supported by the described scenario. The key clue is that 'routing is properly configured,' meaning the serial link mismatch is the logical culprit.

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