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

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

选项 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.

答案A,D

解析 因为RC的e0口down,所以主机1的数据包到达RC后,RC向主机返回一个icmp的目的地不可达信息。
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