HDLC协议中采用比特填充技术的目的是（）。
- A.避免帧内部出现01111110序列时被当作标志字段处理
- B.填充数据字段，使帧的长度不小于最小帧长
- C.填充数据字段，匹配高层业务速率
- D.满足同步时分多路复用需求
正确答案及解析
正确答案
解析
HDLC帧结构中，01111110被认为是帧边界。为了避免帧内部出现01111110序列时被当作边界字段处理，HDLC采用零比特填充法使一帧中不会出现6个连续1。
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