The aaa authentication enable default command

After enabling AAA globally on the access server, you need to define the authentication method lists and apply them to lines and interfaces. These authentication method lists are security profiles that indicate the service, PPP, dotlx, or login and authentication method. Up to four authentication methods (local, group TACACS+, group RADIUS, line, or enable authentication) may be applied to a line or interface. A good security practice is to have either local or enable authentication as the...

Threats to and Attacks on Routers

Information theft Examples of attack techniques IP fragmentation attacks for DoS Some general threats to routers include (but are not limited to) unauthorized access, session hijacking, rerouting, masquerading, DoS, eavesdropping, and information theft. Unauthorized access may occur when one of the following occurs Session hijacking may occur if an attacker can insert falsified IP packets after session establishment via IP spoofing, sequence number prediction and alteration, or other methods....