Glossary

ASA (Adaptive Security Algorithm)—

A Cisco proprietary methodology of ensuring security.

CBAC (Context-based Access Control)—

A Cisco proprietary method of allowing returning traffic through a router only after packets requesting that session have traveled out the same interface.

DoS (denial of service)—

A form of attack that attempts to deny the availability of a network or host, usually by overwhelming that network or host with requests.

NAT (Network Address Translation)—

NAT is the process where the source or destination address of IP packets is changed as these packets traverse a router or firewall. NAT allows a network using private IP addresses to connect to the Internet using public IP addresses.

RADIUS (Remote Access Dial-In User Service)—

A protocol used to authenticate users on a network.

TACACS (Terminal Access Controller Access Control System)—

A protocol used to authenticate users on a network. Also provides authorization and accounting facilities.