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 lad 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).
75（）
A．destinations
B．resources
C．packets
D．sources
）是一种放射性元素，在其分裂过程中，会释放出一种新的粒子，变成镎（
），由于放出的这种粒子很容易被空气阻隔，因此不会对人体构成任何的危害，火警的报警系统就是利用这种粒子作为报警的重要工具，这种粒子是（ ）