In HDLC protocol, when supervisory frame's type code is '00'. About the following state-ments, which is correct ( )
A.receive ready
B.receive not ready
C.reject
D.selective reject
参考答案:A
In HDLC protocol, when supervisory frame's type code is '00'. About the following state-ments, which is correct ( )
A.receive ready
B.receive not ready
C.reject
D.selective reject
参考答案:A