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

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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