计算机网络
练习（一百三十九）
- Routing in circuit-switching networks has traditionally involved a static routing strategy with the use of（1）paths to respond to increased load . modern routing strategies provide more adaptive and flexible approaches . the routing function of a packet-switching network attempts to find the least-cost route through the network , with cost based on the number of （2）,expected delay , or other metrics in virtually all packet-switching networks , some sort of adaptive routing technique is used . adaptive routing algorithms typically rely on the（3）of information about traffic conditions among nodes . in most cases , adaptive strategies depend on status information that is（4）at one place but used at another . there is a tradeoff here between the quality of the information and the amount of（5）the exchanged information is itself a load on the constituent networks, causing a performance degradation.
问题1：
A. only
B. single
C. alternate
D. series
问题2：
A. hops
B. sites
C. members
D. points
问题3：
A. exchange
B. transportation
C. reception
D. transmission
问题4：
A. rejected
B. collected
C. discarded
D. transmitted
问题5：
A. packets
B. information
C. data
D. overhead
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答案：
C
A
A
B
D
解析：
传统上，电路交换网络中的路由涉及静态路由策略，该策略使用备用路径来响应增加的负载。 现代路由策略提供了更具适应性和灵活性的方法，分组交换网络的路由功能试图通过网络查找成本最低的路由，其成本基于跳数，预期延迟或几乎所有分组中的其他度量。 交换网络，使用某种自适应路由技术。 自适应路由算法通常依赖于节点之间有关流量状况的信息交换。 在大多数情况下，自适应策略取决于在一个地方收集但在另一个地方使用的状态信息。在信息的质量与交换的信息的开销量之间存在折衷，这本身就是组成网络的负担，从而导致性能下降。
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