Serialization delay and(71)delay are the two components of network delay that are improved by increasing bandwidth. Serializatio

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问题 Serialization delay and(71)delay are the two components of network delay that are improved by increasing bandwidth. Serialization delay, i.e. the amount of time it takes to put the(72)on the wire, and queuing delay(depth of the queue)are improved by increasing the(73)from a 128Kbps circuit to a THowever, three other components of delay, routing/switching deiay, distance delay, and protocol delay are components that can not be positively affected by an(74)in bandwidth. If the circuits are not over-utilized, then increasing the bandwidth to improve the(75)of the application will only result in an increased bandwidth with no positive effects on performance.

选项 A、capability
B、cost
C、amount
D、performance

答案D

解析 串行排序延迟和队列延迟是网络延迟的两个主要因素,这些是可以通过增加带宽加以改进的。串行排序延迟(将数据输出到线路上需要的时间)和队列延迟(队列的长度)可以通过把带宽从128Kbps增加到T1得到改善。然而,另外三种延迟因素——路由/交换延迟、距离延迟和协议处理延迟是不能通过增加带宽来改进的。如果线路没有超量使用,则通过增加带宽来改进应用软件性能的企图只能产生一种结果,那就是带宽的增加对性能并没有产生正面的影响。
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