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

642-821 real exams

Exam Code: 642-821

Exam Name: Building Cisco Remote Access Networks (BCRAN)

Updated: Jul 29, 2026

Q & A: 244 Questions and Answers

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Cisco 642-821 Exam Syllabus Topics:

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

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