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Which of the following are true?

Host 1 is trying to communicate with Host 2. The e0 interface on Router C is down. Which of the following are true? (Choose two.)

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A.
Router C will use ICMP to inform Host 1 that Host 2 cannot be reached.

B.
Router C will use ICMP to inform Router B that Host 2 cannot be reached.

C.
Router C will use ICMP to inform Host 1, Router A, and Router B that Host 2 cannot be reached.

D.
Router C will send a Destination Unreachable message type.

E.
Router C will send a Router Selection message type.

F.
Router C will send a Source Quench message type.

2 Comments on “Which of the following are true?

  1. Ecommerce says:

    Host 1 is trying to communicate with Host 2. Its packets travel from routerA to routerB and router C. Router C (the last router) then broadcast an ARP frame onto the network looking for the MAC address of Host 2. If Host 2 can answer then router C can forward the frame. But e0 interface is down so no answer from Host 2 will be received so router C will send a Destination Unreachable message back to the originator. This message also informs that the middle network is still working correctly.

    Also notice that the Destination Unreachable message is an ICMP message.




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