这是发送和接收终端，让信息像差错或丢失的数据包。
It is the sending and receiving endpoints that keeps information about such things as errored or missing packets.
数据链路层的设计主要包括数据包的封装、节点间的介质访问控制和差错控制等工作。
The design for data link layer mainly includes the packet package, the media access control (MAC) between nodes and error control.
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