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单选题
ICMP is short for Internet（1）Message Protocol,and is an integral part of the Internet (72) suite (commonly referred to as TCP/IP).It is a (73) Iayer 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（2）。One of the most well-known and useful message messages in an ICMP datagram is the Destination（3）which is generated for several reasons, including unable to reach a network, a host, a port, or a protocol。
A
B
C
D
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答案：
解析：
根据题目描述，ICMP是Internet控制报文协议（Internet Control Message Protocol）的缩写，这是一个标准的网络协议，用于网络设备之间交换控制信息。因此，第一空应该填入"Protocol"。而其他选项如"Public"、“Private”、"Port"都与题目描述不符。所以正确答案是A。
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