Microsoft's ISA Server (Internet Security and Acceleration Server) is the successor to Microsoft's Proxy Server 2.0 (see proxy server) and is part of Microsoft's .NET support. ISA Server provides the two basic services of an enterprise firewall and a Web proxy/cache server. ISA Server's firewall screens all packet-level, circuit-level, and application-level traffic. The Web cache stores and serves all regularly accessed Web content in order to reduce network traffic and provide faster access to frequently-accessed Web pages. ISA Server also schedules downloads of Web page updates for non-peak times.

Microsoft's ISA Server (internet Security and Acceleration Server) is the successor to Microsoft's Proxy Server 2.0 (see proxy server) and is part of Microsoft's .NET support. ISA Server provides the two basic services of an enterprise firewall and a Web proxy/cache server. ISA Server's firewall screens all packet-level, circuit-level, and application-level traffic. The Web cache stores and serves all regularly accessed Web content in order to reduce network traffic and provide faster access to frequently-accessed Web pages. ISA Server also schedules downloads of Web page updates for non-peak times.

A network security plan

A network risk analysis

No,general antivirus cannot show virus websites,you need to switch to internet security versions of the same.The internet security versions scan for the server consistency

VoIP server need fast internet connection, high end computers tight firewall or security and often maintenance.