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)

A．calls

B．metrics

C．links

D．destinations

实践育人应（）

A.开展以诚实守信、文明礼貌、遵纪守法、勤劳好学、节约环保、团结友爱等为主题的系列行动。

B.组织学生广泛参加“学雷锋”等志愿服务和社会公益活动。教育学生主动承担家务劳动。

C.组织学生在每个学段至少参加1次学工学农生产体验劳动。

D.逐步完善中小学生开展社会实践的体制机制，把学生参加社会实践活动的情况和成效纳入中小学教育质量综合评价和学生综合素质评价。