考试：国家电网招聘
问题：
BGP runs over a reliable transport （ ）. This eliminates the need to implement explicit update fragmentation, retransmission, acknowledgement, and （ ）. 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, i.e., that all outstanding data will be delivered （请作答此空）the connection is closed.
A：after
B：before
C：earlier
D：concurrently
答案：
解析：
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计算机(电网) 电网 eliminates implement transport explicit
