Chapter 8. Routers and Routing Protocol Hardening - Implementing Cisco IP Routing (ROUTE) Foundation Learning Guide: (CCNP ROUTE 300-101) [Book]
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PDF) Hardening CISCO Devices based on Cryptography and Security Protocols - Part II: Implementation and Evaluation
CCNA Routing and Switching Portable Command Guide (ICND1 100-105, ICND2 200-105, and CCNA 200-125), 4th Edition | Cisco Press
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