Ports Protocol21 FTP22 SSH23 25 SMTP53 DNS69 TFTP110 POP3119 NNTP161 HostTCP80:HTTP443:HTTPSRng252/30624248/2953TCP8240/2844Both!16224/273532192/262664128/2517UDP1280/24080ProtocolTypeAdminDistMetricsNotesEIGRPHybrid90Multiple32-positeClassless,VLSM,DUAL,RTP,PDMs(1xtablesetperprot),multipleAS#s,multL3prots,summarizationIGRPDist-Vector100Bandwidth,DelayCiscoprop,255max-hop-ct(100default),AS#,******@90sec,******@270sec,hold-down280secs,flush630secs,classless,VLSMOSPFLink-state110BandwidthDijkstraalg,classless(VLSM),wildcardmaskRIPv1Dist-Vector120Hopcountclassful,30secupdates,180secrouteinvalid,240secrouteflush,(Bellman-Fordalg),round-robinloadbalancing()layerProtocols7ApplicationData4ApplicationSNMP,,FTP,TFTP6PresentationData5SessionData4TransportSegment3TransportTCP,workIP,OSPF,RIP,workInterfacelower-layerprotocolstandards1PhysicalBitsIPClasses PrivateIPsA 1–126 – 128–191 – 192–223 –:STPStatesBlockingPreventinguseofloopedpathsListeningPreptoforwardw/opopulatingMACtableLearningPopulateMACtable,notforwardingForwardingSending/rcvingdataframesdialermap<protocol><next-hop-address>dial-stringDDRdialingsequence:routedeterminationIDinterestingtrafficDialerinfolookupTraffictxnCallterminated/timedoutStandardACL:Cisco(config)#access-list<1-99><deny|permit><sourceIP><WCmask>Cisco(co
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