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Harden perimeter routers with Cisco firewall functionality and features to ensure network security
* Detect and prevent denial of service (DoS) attacks with TCP Intercept, Context-Based Access Control (CBAC), and rate-limiting techniques
* Use Network-Based Application Recognition (NBAR) to detect and filter unwanted and malicious traffic
* Use router authentication to prevent spoofing and routing attacks
* Activate basic Cisco IOS filtering features like standard, extended, timed, lock-and-key, and reflexive ACLs to block various types of security threats and attacks, such as spoofing, DoS, Trojan horses, and worms
* Use black hole routing, policy routing, and Reverse Path Forwarding (RPF) to protect against spoofing attacks
* Apply stateful filtering of traffic with CBAC, including dynamic port mapping
* Use Authentication Proxy (AP) for user authentication
* Perform address translation with NAT, PAT, load distribution, and other methods
* Implement stateful NAT (SNAT) for redundancy
* Use Intrusion Detection System (IDS) to protect against basic types of attacks
* Obtain how-to instructions on basic logging and learn to easily interpret results
* Apply IPSec to provide secure connectivity for site-to-site and remote access connections
* Read about many, many more features of the IOS firewall for mastery of router security
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