题目内容

IEEE 802系列标准是LAN的国际标准系列。依据IEEE 802标准，讨论以下问题：
1．在IEEE 802系列标准中，LAN参考模型对应OSI参考模型的数据链路层和物理层，它将数据链路层划分为哪两个子层？
2．在IEEE 802系列标准中，哪一个标准描述逻辑链路子层的功能、特性和协议？
3．IEEE 802.3标准定义了CSMA/CD总线介质访问控制方法，CSMA/CD基本工作原理？
IEEE 802.6标准定义的内容？

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