ccnav 7.0

ccnav 7.0.. Link-state protocols (such as OSPF) use SPF algorithms and know the complete network topology (based on advertised route selection) They send LSAs - specific routes - as multicasts when the network changes. LSAs are stored in link state databases. These protocols converge quickly, one because they use incremental updates. but take up more memory and CPU cycles. They also support hierarchy and route summarization.. Hybrid protocols (such as RIPv2 and EIGRP) combine the advantages of both distance vectoring protocols and link state protocols.Problems with distance vectoring protocols and their solutions . Distance vectoring protocols use periodic updates and therefore converge slowly. To overcome this problem, some distance vectoring protocols use triggered updates. . Distance vector protocols are prone to routing loops. To solve this problem, they use the following mechanisms: hop limit, horizontal splitting, suppressed routing and suppressed timer. . To prevent packets from going on endlessly in the loop, distance vectoring protocols typically set a hop count limit, which determines how far the packet can travel and is referred to as the maximum hop count or TTLo . Horizontal splitting provides that a route received from a neighboring router is not re-announced to the neighboring router through the interface that received it.. When route suppression is enabled. the router finds that a directly connected route has failed and suppresses it-sets its metric to infinity and advertises it to its neighbors. When a router advertises a suppressed route to a neighbor. the neighbor will violate the horizontal split rule and send the given suppressed route back to the originating router. this is called reverse suppression. To give the router enough time to propagate the suppressed route and to avoid routing loops during provisioning, the router implements a suppression timer mechanism.14.6 Self-Test QuestionsIntroduction to Routing1. is the protocol being routed.A. RIPB. OSPFC. both RIP and OSPF