【71-75】the metric assigned to each network depends on the type of protocol.some simple protocol，likerip， treats each network as equals.the （71） of passing through each network is thesame;itisone （72） count.so if a packet passes through 10 network to reach the destination，thetotalcost is 10 hop counts.other protocols， such as OSPF， allow the administrator to assignacostforpassing through a network based on the type of service required.a （73）through anetworkcanhave different costs（metrics）.for example， if maximum （74） is the desired typeofservice，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 satelliteline.OSPFallow each router to have several routing table based on the required type of service.
