● Routing protocols use different techniques for assigning（71）to individual networks．Further, each r

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● Routing protocols use different techniques for assigning（71）to individual networks．Further, each routing protocol forms a metric aggregation in a different way. Most routing protocols can use multiple paths if the paths have an equal（72）.Some routing protocols can even use multiple paths when paths have an unequal cost.In either case,load（73）can improve overall allocation of network bandwidth. When multiple paths are used,there are several ways to distribute the packets. The two most common mechanisms are per-packet load balancing and per-destination load balancing.Per-packet load balancing distributes the（74）across the possible routes in a manner proportional to the route metrics,Per-destination load balancing distributes packets across the possible routes based on（75）.

（71）A. calls B. metrics C. links D. destinations （72）A. user B. distance C. entity D. cost （73）A. bracketing B. balancing C. downloading D. transmitting （74）A. destinations B. resources C. packets D. sources （75）A. destinations B. resources C. packets D. sources

参考答案:

（71）B（72）D（73）B（74）C（75）A解析：路由协议使用各种技术来确定到达不同网络的跳数。此外，每个路由协议用不同的方法形成一个跳数聚集。大多数路由协议可以使用多条路径，如果它们代价相等，一些路由协议甚至可以在路径代价不等时也使用多条路径。在任何情况下，负载均衡可以提高整体的网络带宽分配。当使用多条路径时，有几种方法分配数据包。最常见的两种机制是按包负载平衡和按目的地负载平衡。按包负载均衡是按路由跳数成比例地分配数据包。按目的地负载平衡是基于目的地来分配数据包。

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