(第1空)Routing protocols use different techniques for assigning ( ) 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 ( ) . Some routing protocols can even use multiple paths when paths have an unequal cost In either case, load ( ) 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 ( ) across the possible routes in a manner proportional to the route metrics. Per-destination load balancing distributes packets across the possible routes based on ( ).