ICMP USES the basic support of IP as if it were a higher level protocol.
ICMP使用IP的基本支持，就好象是更高级别的协议。
This service is used by the next higher level protocol: the Internet protocol (IP).
高一级别的协议—网际协议(IP)使用这一服务。
ICMP is used by IP as well as some higher level protocols, such as Transmission Control protocol (TCP).
icmp由ip和一些更高级别的协议使用，如传输控制协议(TCP)。
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