IEEE 802.1x是一种基于（ ）认证协议。
- A.用户ID
- B.报文
- C.MAC地址
- D.SSIDC选项比A选项更优的是，A选项应该加上用户ID和密码。802.1x协议也可以扩展到基于MAC地址的认证。
正确答案及解析
正确答案
解析
802.1x协议是基于Client/Server的访问控制和认证协议。它可以限制未经授权的用户/设备通过接入端口（access port）访问LAN/WLAN。在获得交换机或LAN提供的各种业务之前，802.1x对连接到交换机端口上的用户/设备MAC地址进行认证。在认证通过之前，802.1x只允许EAPoL（基于局域网的扩展认证协议）数据通过设备连接的交换机端口；认证通过以后，正常的数据可以顺利地通过以太网端口。
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