●SDLC was invented by IBM to replace the older Bisynchronous protocol for wide area connec
(71) A.HDLC
B.Frame. Relay
C.X.25
D.X.21
(72) A.a peer to peer
B.a point-to-point
C.not a peer to peer
D.a peer to peers
(73) A.a primary station
B.one or more primary stations
C.a secondary station
D.one or more secondary stations
(74) A.a primary station
B.one or more primary stations
C.a secondary station
D.one or more secondary stations
(75) A.half duplex
B.full duplex
C.half or full duplex
D.half and full duplex