In HDLC, frame acknowledgment, flow and error control are the functions of .
A、Information(I)frame;
B、Supervisory(S)frame;
C、Unnumbered(U)frame;
D、anyoneofI,U,Sframe
发布时间:2025-10-28 16:46:42
A、Information(I)frame;
B、Supervisory(S)frame;
C、Unnumbered(U)frame;
D、anyoneofI,U,Sframe