网络方面知识ccna等中英文icnd110s04l01.pptx

LANConnections

RoutersRoutershavethefollowingcomponents:CPUMotherboardRAMROMRoutershavenetworkadapterstowhichIPaddressesareassigned.Routersmayhavethefollowingtwokindsofports:Console:FortheattachmentofaterminalusedformanagementNetwork:DifferentLANorWANmediaportsRoutersforwardpacketsbaseduponaroutingtable.Cisco2800SeriesRouter

RouterX#showiprouteD192.168.1.0/24[90via10.1.1.11R192.168.2.0/24[120/4]via10.1.1.2O192.168.3.0/24[110/229840]via10.1.1.32LetsotherroutersknowaboutchangesDetermineswheretoforwardpacketsRouterFunctions

PathDetermination

RoutingTables

RoutingTableEntriesDirectlyconnected:RouterattachestothisnetworkStaticrouting:EnteredmanuallybyasystemadministratorDynamicrouting:LearnedbyexchangeofroutinginformationDefaultroute:Staticallyordynamicallylearned;usedwhennoexplicitroutetonetworkisknown

RoutingMetrics

LessonAimEnterlessonaimhere.DistanceVectorRoutingProtocolsPassesperiodiccopiesofroutingtabletoneighborroutesandaccumulatesdistancevectors

LessonAimEnterlessonaimhere.Link-StateRoutingProtocolsAfterinitialflood,passessmallevent-triggeredlink-stateupdatestotherrouters

SummaryRoutershavecertaincomponentsthatarealsofoundincomputersandswitches,suchastheCPU,motherboard,RAM,andROM.RoutershavetwoprimaryfunctionsintheIPpacketdeliveryprocess:maintainingroutingtablesanddeterminingthebestpathtobeusedtoforwardpackets.RoutersdeterminetheoptimalpathforforwardingIPpacketsbetweennetworks.Routerscanusedifferenttypesofroutestoreachthedestinationnetworks,includingstatic,dynamic,anddefaultroutes.Routingtablesprovideanorderedlistofbestpathstoknownnetworks,andincludeinformationsuchasdestination,next-hopassociations,androutingmetrics.Routingalgorithmsprocessthereceivedupdatesandpopulatetheroutingtablewiththebestroute.

Summa