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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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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