摘要：对于【网络工程师】软考考试而言，试题无疑是最重要的学习资料之一。在软考备考过程中，吃透试题、掌握试题所考知识点、熟悉试题的出题思路，对我们提升分数的效果是最明显的，通过对试题的反复练习，还可以查漏补缺。今天，给大家带来【2012年5月 网络工程师 上午题】部分试题的详解，一起来看看吧~



1、Selecting afixed retransnussion time for all connections can result in serious consequences. Ifthe retransmission time does not allow enough time for a (73) to reach the destination and an acknowledgment to reach the source, it can result in retransmission of segments that are still on the way. Conversely, if the retransnussion time is longer than necessary for a short path, it may result in delay for the application programs.
A、 process
B、 segment
C、 program
D、 user

答案:B
答题解析:

网络工程师



2、Even for one single connection, the retransmission time should not be fixed.A connection may be able to send segments and receive (74)faster during nontraffic period than during congested periods. TCP uses the dynamic retransmission time,a transmission time is different for each connection and which may be changed during the same connection. 
A、 connections
B、 requests
C、 acknowledgments
D、 datagrams

答案:C
答题解析:

网络工程师



3、Retransmission time can be made(75)   by basing it on the round-trip time (RTT). Several formulas are used for this purpose. 
A、 long
B、 short
C、 fixed
D、 dynamic

答案:D
答题解析:

网络工程师



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