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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The two most popular transport layer protocols are the transmission control protocol (TCP) and the user datagram protocol (UDP)

两种最流行的传输层协议是传输控制协议（TCP）和用户数据报协议（UDP）

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The IP layer, in turn, provides services used by the Internet Control Message Protocol (ICMP) and Transmission Control Protocol (TCP).

反过来，ip层又提供由网际控制报文协议(ICMP)和传输控制协议(TCP)使用的服务。

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Known as TCP, the Transmission Control Protocol is core to the functioning of the the Internet.

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