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Cisco 642-503 exam : Securing Networks with Cisco Routers and Switches

642-503 Exam Simulator
  • Exam Code: 642-503
  • Exam Name: Securing Networks with Cisco Routers and Switches
  • Updated: Jul 19, 2026
  • Q & A: 56 Questions and Answers
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Cisco 642-503 Exam Syllabus Topics:

SectionObjectives
VPN and Secure Connectivity- IPsec fundamentals
  • 1. IKE phases
    • 2. Encryption and authentication methods
      - Site-to-site VPN configuration concepts
      • 1. Tunnel establishment
        Access Control and Traffic Filtering- ACL implementation
        • 1. Standard and extended ACLs
          • 2. Time-based ACLs
            - Traffic filtering techniques
            • 1. Control plane and data plane filtering
              Secure Network Services- NAT and PAT security considerations
              • 1. Address translation security implications
                - DHCP and DNS security
                • 1. DNS attack mitigation basics
                  • 2. DHCP snooping concepts
                    Management and Monitoring Security- AAA services
                    • 1. RADIUS and TACACS+
                      • 2. Authentication, Authorization, Accounting concepts
                        - Device monitoring tools
                        • 1. SNMP security considerations
                          • 2. Syslog configuration
                            Secure Routing Protocols- Routing protocol authentication
                            • 1. BGP session security basics
                              • 2. EIGRP authentication
                                • 3. OSPF authentication (MD5)
                                  Network Device Security Fundamentals- Device vulnerability mitigation
                                  • 1. Physical and logical access control
                                    • 2. Image and firmware security
                                      - IOS Security Hardening
                                      • 1. Securing administrative access (SSH, Telnet restrictions)
                                        • 2. Disabling unused services and ports
                                          • 3. Password policies and encryption

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