● The metric assigned to each network depends on the type of protocol.Some simple protocol, like RIP, treats each network as equals.The 　（71）　 of passing through each network is the same;it is one 　（72）　 count.So if a packet passes through 10 network to reach the destination, the total cost is 10 hop counts.Other protocols, such as OSPF, allow the administrator to assign a cost for passing through a network based on the type of service required.A 　（73）　 through a network can have different costs（metrics）.For example, if maximum 　（74）　 is the desired type of service, a satellite link has a lower metric than a fiber-optic line.On the other hand, if minimum 　（75）　 is the desired type of service, a fiber-optic line has a lower metric than a satellite line.OSPF allow each router to have several routing table based on the required type of service.