CCNA认证考试(collectedfromBraindumps)(7)

文章作者 100test 发表时间 2007:04:06 21:49:50
来源 100Test.Com百考试题网

problem: routing loops (slow detection of topology change, incorrect routing table/0updates)

solution: split horizon ("if you learn a route on one interface do not send back that info on that same interface")

solution: route poisoning ("set route to infinity")

solution: hold-down timers ("ignore 0updates for some time")

problem: counting to infinity (incorrect routing table/0updates)

solution: define a maximum ("max. hop count 1 = infinity")

problem: link-state 0updates can arrive at different time based

on bandwidth (slow and fast links)

solution: dampen the periodic 0update (longer intervals)

solution: use time stamps

solution: use targeted multicast (not flood), define router

hierarchies (i.e. partition network)

21) seperate and integrated multiprotocol routing

seperate: "ships-in-the-night" routing, i.e. no protocol is affected any other protocol

integrated: replaces native routing algorithm, exchanges common routing info, still maintains seperate routing tables, saves resources, simplifies admin s tasks22) ip classes