31 Days Before Your CCNA Exam

Frame Relay Configuration andTroubleshootingDay 2CCNA 640-802 Exam Topics■Configure and verify Frame Relay on Cisco routers.■Troubleshoot WAN implementation issues.Key TopicsToday we finish our review of CCNA exam topics with a look at Frame Relay and basic WANtroubleshooting. Frame Relay is currently the most popular choice for WAN implementations.Therefore, you must have a basic understanding of Frame Relay, including its conceptual framework,configuration, and verification. As a final topic, we review various WAN errors and theirpotential causes.Frame Relay ConceptsFrame Relay is a connection-oriented data-link technology that is streamlined to provide high performanceand efficiency. For error protection, it relies on upper-layer protocols and dependablefiber and digital networks.Frame Relay defines the interconnection process between the router and the local Frame Relay ofthe service provider, as shown in Figure 2-1.Figure 2-1Frame RelayDCE or FrameRelay SwitchFrame Relay works here.Devices attached to a Frame Relay WAN fall into the following two categories:■■Data terminal equipment (DTE): Examples of DTE devices are Frame Relay AccessDevices (FRAD), routers, and bridges.Data communications equipment (DCE): In most cases, the switches in a WAN are FrameRelay switches.