(ISA Server microsoftreg; Internetsecurityandacceleration (ISA) Server2004 is a scalable enterprise firewall and built on microsoftwindowsserver? 2003 and windowsreg; 2000server operating system security, management and Web cache server on the directory to achieve policy based Internet access control, plus Speed and management. The Internet provides organizations with opportunities to connect with customers, partners, and employees. The existence of this opportunity also brings risks and problems related to safety, performance and manageability. ISA Server is designed to meet the needs of companies that currently conduct business through the Internet. ISA Server provides multi-layer enterprise firewall to help prevent network resources from being attacked by viruses, hackers and unauthorized access. Isaserver2004web caching enables organizations to save network bandwidth and improve web access speed by providing objects locally rather than through the crowded Internet.)