Cisco 642-821 Exam Questions : Building Cisco Remote Access Networks (BCRAN)

  • Exam Code: 642-821
  • Exam Name: Building Cisco Remote Access Networks (BCRAN)
  • Updated: Oct 05, 2026
  • Q&As: 244 Questions and Answers

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Cisco 642-821 Exam Syllabus Topics:

SectionObjectives
ISDN and PPP Implementation- ISDN configuration and troubleshooting
  • 1. BRI and PRI concepts
    • 2. Switch types and signaling
      - Point-to-Point Protocol (PPP)
      • 1. PPP encapsulation and LCP/NCP
        • 2. Authentication methods (PAP, CHAP)
          WAN Technologies and Remote Access Fundamentals- WAN connectivity concepts
          • 1. Remote access architectures and components
            • 2. Leased lines, circuit-switched and packet-switched networks
              - Dial technologies
              • 1. PSTN and ISDN fundamentals
                • 2. Dial-on-Demand Routing (DDR)
                  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. Layered troubleshooting approach
                        • 2. Common WAN connectivity issues
                          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
                                  Frame Relay and WAN Optimization- Frame Relay concepts
                                  • 1. DLCI, LMI types, and virtual circuits
                                    • 2. Inverse ARP and mapping
                                      - Traffic and performance optimization
                                      • 1. Subinterfaces and hub-and-spoke design
                                        • 2. Congestion management basics

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