Traceroute在进行路由追踪时发出的ICMP消息（），收到的消息是中间节点或目的节点返回的（作答此空）。
- A.Destination?Unreachable
- B.TTL?ExceedeD
- C.Parameter?Problem
- D.Source?Route?FaileD
正确答案及解析
正确答案
解析
Traceroute命令利用ICMP协议定位客户端和目标端之间路径上的所有路由器。客户端直接发送一个ICMP回显请求（Echo?Request）数据包，并且第一个request的TTL为1，第二个request的TTL为2，以后依此递增直至第30个；中间的router送回ICMP?TTL-expired报文。服务器在收到回显请求的时候会向客户端发送ICMP回显应答（Echo?Reply）数据包。
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