In reliable protocols such as TCP and HDLC, a timer is required to timing for data package overtime retransmission.
在TCP、HDLC等能提供可靠通信服务的通信协议中，需要使用定时器来对数据包的超时重发进行计时。
Traditional TCP protocol's design was just concerning about wire network. It contributes the loss of data package to network congestion and employ congestion-control process to solve the problem.
传统的TCP协议是针对有线网络设计的，它认为数据包的丢失皆是由网络拥塞造成，从而启动拥塞控制过程。
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