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Cisco 642-821 Exam Syllabus Topics:

SectionObjectives
Topic 1: Routing and Troubleshooting in Remote Access Networks- Routing protocols in WAN environments
  • 1. Dynamic routing integration overview
    • 2. Static routing for remote access
      - Troubleshooting methodologies
      • 1. Common WAN connectivity issues
        • 2. Layered troubleshooting approach
          Topic 2: VPN and Secure Remote Access- VPN fundamentals
          • 1. GRE tunnels overview
            • 2. IPSec concepts (intro level)
              - Secure authentication
              • 1. AAA framework basics
                • 2. Remote access security considerations
                  Topic 3: ISDN and PPP Implementation- ISDN configuration and troubleshooting
                  • 1. Switch types and signaling
                    • 2. BRI and PRI concepts
                      - Point-to-Point Protocol (PPP)
                      • 1. PPP encapsulation and LCP/NCP
                        • 2. Authentication methods (PAP, CHAP)
                          Topic 4: Frame Relay and WAN Optimization- Traffic and performance optimization
                          • 1. Congestion management basics
                            • 2. Subinterfaces and hub-and-spoke design
                              - Frame Relay concepts
                              • 1. DLCI, LMI types, and virtual circuits
                                • 2. Inverse ARP and mapping
                                  Topic 5: WAN Technologies and Remote Access Fundamentals- Dial technologies
                                  • 1. Dial-on-Demand Routing (DDR)
                                    • 2. PSTN and ISDN fundamentals
                                      - WAN connectivity concepts
                                      • 1. Remote access architectures and components
                                        • 2. Leased lines, circuit-switched and packet-switched networks

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