【71-75】routing protocols use different techniques for assigning （71）to individual network.further，each routing protocol forms a metric aggregation in a different way. most routing protocolscanusemultiple paths if the paths has an equal （72） . some routing protocols can even use multiplepathswhen paths have an unequal cost. in either case， load （73） can improve overall allocationofnetworkbandwidth. when multiple paths are used， there are several ways to distribute the packets.thetwomost common mechanisms are per-packet load balancing and per-destination load balancing.per-packetload balancing distributes the （74） across the possible routes in a manner proportionaltotheroutemetrics. per-destination load balancing distributes packets across the possible routes basedon（75）.
