ICMP is used by IP as well as some higher level protocols, such as TransmissionControl 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 transmissioncontrol 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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Linux also supports protocols such as the Stream ControlTransmission protocol (SCTP), which provides many advanced features above TCP (as a replacement transport level protocol).