If two communicating entities are in different hosts connected by a network,there is a risk that PDUs will not arrive in the ord

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问题   If two communicating entities are in different hosts connected by a network,there is a risk that PDUs will not arrive in the order in which they were sent,because thev may traverse (71)____ paths through the network.If each PDUs is given a unique number.and numbers are assigned (72)____,then it is a logically simple task for the receiving entity to reorder (73)____ PDUs on the basis of sequence number.A problem with this scheme is that,with a(74)____.sequence number field,sequence number will repeat.Evidently,the maximum sequence number must be (75)____ than the maximum number of PDUs that could be outstanding at any time.
(73)

选项 A、received
B、sent
C、transmitting
D、forwarding

答案A

解析
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