SDLC was invented by IBM to replace the older Bisynchronous protocol for wide area connections between IBM equipment . A varietion of the (71) protocol called NRM is essentially the same as SDLC. SDLC is (72) protocol like HDLC, Frame. Relay or X.25. An SDLC network is made up of (73) that controls all communications, and (74) . It is capable of (75) operation, but almost all practical applications are strictly half duplex.

A．HDLC

B．Frame. Relay

C．X.25

D．X.21

[单选题]SDLC was invented by IBM to replace the older Bisynchronous protocol for wide area connections between IBM equipment ．A varietion of the (71) protocol called NRM is essentially the same as SDLC．SDLC is (72) protocol like HDLC , Frame. Relay or X．25．A

[名词解释] 英译汉：replace

[试题]() switching was invented in the late 1960s for data communications.A．Frame B．Link C．Packet D．Line

[单选题]Why do people replace the term creationism with the term intelligent design nowadays?A．Because "intelligent design" represents the modified theory of evolution.B．Because they believe God created different species.C．Because the term creationism is u

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[单选题]The Systems Development Life Cycle (SDLC) is a process of creating oralteri

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[主观题]E．dison invented the light bulb many years ago（改为被动语态）The light bulb__________ __________by Edison many years ago．

[问答题]Actually the umbrella was not invented as protection against rain.