下列哪项OSI第2层功能是由PPP协议标准规范，但使用CISCO专有的HDLC报头字段实现A.成帧B.寻址C.错误检测D.识别帧内的协议类型
下列哪项OSI第2层功能是由PPP协议标准规范，但使用CISCO专有的HDLC报头字段实现
A.成帧
B.寻址
C.错误检测
D.识别帧内的协议类型
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