●RPC使用 (63) 模式。

●DNS工作于 (64)

●在以太网卡中，16位网卡的总线类型一般为 (65) 。

●In the following essay，each blank has four choices．Choose the best answer and write down on the answer sheet．

●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．

●试题四