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Protecting Against Unauthorized Access
Mitigating unauthorized access is one of the easier mitigation techniques. Because an attacker must be able to access a port to gain unauthorized access to the system, the simple solution is to deny access to that port. For example, for an attacker to gain access to a system, she may need to Telnet to that system. By blocking Telnet access to systems at the router for DMZ systems and the firewall, you can prevent the attacker from reaching the Telnet port on the protected systems. Mitigation of unauthorized access comes down to implementing tight ACLs both on routers and on firewalls.
