Transport Layer protocols, such as the Transmission Control Protocol (TCP), the User Datagram Protocol (UDP), specify a source and destination port number in their packet headers.

传输层协议，诸如传输控制协议（TCP），用户数据报协议（UDP）， 会在它们的头部指定一个资源和目的地的端口号。

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Using traditional transmission power control mechanism in data link layer of wireless AD hoc network may result in the increased packet collisions among nodes which use different transmission power.

在无线自组织网数据链路层中，采用传统的功率控制机制会引起不同发射功率节点间的分组冲突。

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The design for data link layer mainly includes the packet package, the media access control (MAC) between nodes and error control.

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。

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