In HDLC protocol, when supervisory frame’s type code is ’00’.About the following state-ments, which is correct? ( )

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问题 In HDLC protocol, when supervisory frame’s type code is ’00’.About the following state-ments, which is correct? (    )

选项 A、receive ready
B、receive not ready
C、reject
D、selective reject

答案A

解析
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