Overview of Authentication, Authorization, and Accounting (AAA)AAA ArchitectureAAA Communication ProtocolsTACACS+TACACS+ Operation for AuthenticationTACACS+ Operation for AuthorizationTACACS+ Operation for AccountingRADIUSRADIUS Operation for Authentication and AuthorizationRADIUS Operation for AccountingDifference between RADIUS and TACACS+Diagnostic Commands and Toolsshow Commandsdebug CommandsAnalysis of Problem AreasRouter Management TroubleshootingLogin AuthenticationConfiguration StepsTroubleshooting StepsEnable Password AuthenticationExec AuthorizationCommand AuthorizationAccountingDialup Networking TroubleshootingAuthentication and Authorization for Dialup NetworkingDownloading ACL per User Basis Using Filter-idDownloading ACL/ROUTES, WINS, and DNS IP Using AV PairAccounting for Dialup NetworkingX-Auth Troubleshooting for IPsecAuth-proxy TroubleshootingCase StudiesRouter ConfigurationLAC ConfigurationRADIUS Server ConfigurationLAC RADIUS ConfigurationLNS RADIUS ConfigurationTroubleshooting StepsLAC Router TroubleshootingLNS Router TroubleshootingCommon Problems and ResolutionsBest Practices