本标准是为促进局域网（LAN）上计算机和终端的互连而制定的一套标准之一。它通过开放系统互连参考模型与其他标准相关联。 注:本标准中描述的层与OS1参考模型定义的层之间的确切关系正在研究中。 本标准描述了IEEE Std 802局域网协议中逻辑链路控制（LLC）子层的功能、特点和协议。 LLC子层构成数据链路层（见图1-1）中的顶层子层，是IEEE/Std 802活动定义和支持的各种媒体访问方法的共同部分。 单独的标准分别描述了每种介质访问方法，并指出了介质访问控制（MAC）子层在每种情况下提供的附加特性和功能，以完成802体系结构参考模型中定义的数据链路层的功能。

This standard is one of a set of standards produced to facilitate the interconnection of computers and terminals on a local area network (LAN). It is related to the other standards by the Reference Model for Open Systems Interconnection. NOTE: The exact relationship of the layers described in this standard to the layers defined by the OS1 Reference Model is under study. This standard describes the functions, and features and protocol of the Logical Link Control (LLC) Sublayer in the IEEE Std 802 Local Area Network Protocol. The LLC sublayer constitutes the top sublayer in the Data Link Layer (see Fig 1-1) and is common to the various medium access methods that are defined and supported by the IEEE/Std 802 activity. Separate standards describe each medium access method individually and indicate the additional features and functions that are provided by the Medium Access Control (MAC) Sublayer in each case to complete the functionality of the Data Link Layer as defined in the 802 architectural reference model.