2. 计算机
  3. ICMP is short for Internet (71) Message Protocol，and is an integral part of the Internet (72) suite(commonly referred to as

ICMP is short for Internet (71) Message Protocol，and is an integral part of the Internet (72) suite(commonly referred to as

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问题 ICMP is short for Internet  (71)  Message Protocol，and is an integral part of the Internet  (72)  suite(commonly referred to as TCP／IP)．It is a  (73)  layer protocol used by network devices to diagnose network communication issues．IP is not designed to be absolutely reliable．ICMP is to provide feedback about problems in the communication environment，not to make IP  (74)  ．One of the most well-known and useful messages in an ICMP datagram is the Destination  (75)  message which is generated for several reasons，including unable to reach a network，a host，a port，or a protocol．
     (75)
选项 A、Unreliable
B、Unavailable
C、Unreachable
D、Unusable
答案C
解析 ICMP是Internet控制消息协议的缩写，是Internet协议套件(通常称为TCP／IP)的组成部分。它是网络设备用来诊断网络通信问题的网络层协议。IP的设计并不是绝对可靠的。ICMP是为通信环境中的问题提供反馈，而不是使IP变得可靠。ICMP数据报中最著名和最有用的消息之一是目的地不可到达消息，该消息由以下几个原因生成，包括无法到达网络、主机、端口或协议。
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