Employing Proxy Services

摘要

As use of the TCP/IP suite expanded during the 1990s in tan- dem with the increased use of the Inter- net, organizations began to realize a new security threat emerged as their networks were connected to the Internet. As aca- demic, government, and commercial net- works were connected to the Internet, they became subject to attack from an unlim- ited population of computer users located throughout the world. Router access lists provide a mechanism to enable or disable the flow of packets through router ports based upon source and destination Inter- net Protocol (IP) address and the type of application data, which is expressed in the form of a port number.