【答案】:D 7、计算机系统总线包括①地址总线、②数据总线和⑨控制总线。若采用DMA方式传送数据,需要DMA控制器控制的是( )。 A.①② B.②③ C.①⑧ D.①②③ 【答案】:D 8、BGP runs over a reliable transport ( ). This eliminates the need to implement explicit update fragmentation, retransmission, acknowledgement, and (请作答此空). Any authentication scheme used by the transport protocol may be used in addition to BGP's own ( )mechanisms. The error notification mechanism used in BGP ( )that the transport protocol supports a “graceful” close, ., that all outstanding data will be delivered ( )the connection is closed.