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

  • Exam Code: 642-503
  • Exam Name: Securing Networks with Cisco Routers and Switches
  • Updated: Aug 30, 2026
  • Q & A: 56 Questions and Answers

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Cisco 642-503 Exam Syllabus Topics:

SectionObjectives
Topic 1: Access Control and Traffic Filtering- Traffic filtering techniques
  • 1. Control plane and data plane filtering
    - ACL implementation
    • 1. Standard and extended ACLs
      • 2. Time-based ACLs
        Topic 2: Management and Monitoring Security- Device monitoring tools
        • 1. Syslog configuration
          • 2. SNMP security considerations
            - AAA services
            • 1. Authentication, Authorization, Accounting concepts
              • 2. RADIUS and TACACS+
                Topic 3: VPN and Secure Connectivity- Site-to-site VPN configuration concepts
                • 1. Tunnel establishment
                  - IPsec fundamentals
                  • 1. IKE phases
                    • 2. Encryption and authentication methods
                      Topic 4: Secure Routing Protocols- Routing protocol authentication
                      • 1. OSPF authentication (MD5)
                        • 2. BGP session security basics
                          • 3. EIGRP authentication
                            Topic 5: Secure Network Services- DHCP and DNS security
                            • 1. DNS attack mitigation basics
                              • 2. DHCP snooping concepts
                                - NAT and PAT security considerations
                                • 1. Address translation security implications
                                  Topic 6: Network Device Security Fundamentals- IOS Security Hardening
                                  • 1. Password policies and encryption
                                    • 2. Disabling unused services and ports
                                      • 3. Securing administrative access (SSH, Telnet restrictions)
                                        - Device vulnerability mitigation
                                        • 1. Image and firmware security
                                          • 2. Physical and logical access control

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