36. 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.
Answer: AD
解释:当C的e0口down掉以后,我们会发现在C上e0口的直连路由也会随之消失,那么,我们从host1
去ping host2 时,数据包到了C会被丢掉,因为没有路由,同时,C会对host1 回复一个ICMP不可达
的消息,在路由器里面显示ICMP不可达消息,显示为U.答案AD是正确的
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