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Updated: Oct 13, 2026

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Cisco 642-503 Exam Overview:

Certification Vendor:Cisco
Exam Name:Securing Networks with Cisco Routers and Switches (SNRS)
Exam Number:642-503
Passing Score:Cisco-scaled score (~790/1000, historical; exact passing score not publicly disclosed)
Exam Duration:90 minutes
Exam Price:USD 250 (historical pricing; may vary by region and is discontinued)
Available Languages:English
Real Exam Qty:45-55 (historical range)
Related Certifications:Cisco Certified Network Professional (CCNP)
Cisco Certified Network Associate (CCNA)
Cisco Certified Security Professional (CCSP)
Certificate Validity Period:Retired certification exam (no longer active; CCSP track has been retired)
Exam Format:Simulations, Simlets, Multiple choice
Recommended Training:Cisco Learning Network (SNRS resources)
Exam Registration:Pearson VUE Cisco Exams
Cisco Certification Portal
Sample Questions:Cisco 642-503 Sample Questions
Exam Way:Delivered via Pearson VUE testing centers or online proctored exam (when available during active period; now retired)
Pre Condition:Recommended knowledge of CCNA-level networking concepts; CCNA certification or equivalent experience is typically expected.
Official Syllabus URL:https://www.cisco.com

Cisco 642-503 Exam Syllabus Topics:

SectionObjectives
Secure Routing Protocols- Routing protocol authentication
  • 1. EIGRP authentication
    • 2. BGP session security basics
      • 3. OSPF authentication (MD5)
        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
              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. Physical and logical access control
                      • 2. Image and firmware security
                        VPN and Secure Connectivity- IPsec fundamentals
                        • 1. Encryption and authentication methods
                          • 2. IKE phases
                            - Site-to-site VPN configuration concepts
                            • 1. Tunnel establishment
                              Management and Monitoring Security- Device monitoring tools
                              • 1. Syslog configuration
                                • 2. SNMP security considerations
                                  - AAA services
                                  • 1. RADIUS and TACACS+
                                    • 2. Authentication, Authorization, Accounting concepts
                                      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

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