Abstract
Security and access control is one of the problems that today's network administrators are facing. As networks expand and more networking devices need to be managed, scalability issues arise, particularly if access to these devices is to be centrally managed. As telecommuting becomes more popular, remote access solutions such as dial-up Public Switched Telephone Network (PSTN) and Integrated Services Digital Network (ISDN) connections on network access servers (NAS) need to be managed; the need to keep information internal and private is becoming an absolute necessity due to competitiveness in businesses. This can be accomplished by implementing a security solution known as a firewall—a network device that controls and monitors access to areas of a network—which determines the type of traffic that can enter or leave the network and that can get into the network from the outside. The way Cisco has made it possible to run a software package that includes a built-in firewall is presented.
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