IEEE802.1x是一种基于（）认证协议。
- A.用户 ID
- B.报文
- C.MAC 地址
- D.SSID
正确答案及解析
正确答案
解析
802.1x 协议是基于 Client/Server 访问控制和认证协议。它可以限制未经授权用户/设备通过接入端口（access port）访问 LAN/WLAN。在获得交换机或 LAN 提供各种业务之前， 802.1x 对连接到交换机端口上用户/设备进行认证。 802.1x 认证模式： 1． 端口认证模式该模式下只要连接到端口某个设备通过认证，其他设备则不需要认证，就可以访问网络资源。 2 . MAC 认证模式 该模式下连接到同一端口每个设备都需要单独进行认证,当用户有上网需求时打开 802.1X 客户端程序，输入已经申请、登记过用户名和口令，发起连接请求。
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