Understanding the Internet security and acceleration server (ISA)……!!!!!

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Internet Security & Acceleration server overview

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Microsoft Internet Security and Acceleration Server (ISA Server) is combination of a firewall and Web caching server that can be used to protect the enterprise from external access, while sharing a internet connection on the network. The multilayer firewall of ISA Server protects valuable network resources of the enterprise from unauthorized external access, attacks from hackers, and malicious viruses. You can also control client access to the Internet. The Web cache server enables faster Web access for users by serving objects locally from the cache instead of over the Internet. This in turn improves Internet performance for clients on the network.

When you install ISA Server in your network, you can configure it as

  • A firewall that controls inbound access and outbound access through filters and rules, and various other configuration settings.
  • A Web cache server that manages outbound access through rules, and downloads and caches frequently accessed data.
  • A firewall and Web cache server.

The architecture that ISA Server uses to protect the private network from unauthorized access and still enable users to access the Internet are listed here

  • The ISA Server Firewall service provides in-bound protection and management of protocol specific filters.
  • The ISA Server Web Proxy service provides outbound access.

The clients and servers hosted on the private network that need to access the public network. These include

  • Web proxy clients.
  • SecureNAT clients.
  • Firewall clients.
  • Web servers.
  • Mail servers.

The Different ISA Server Editions and ISA Server Roles

ISA Server Enterprise Edition

  • Provides integration with the Active Directory and additional benefits and features such as centralized server management, multiple levels of access policy, server clustering through arrays, fault-tolerant, and the increased efficiencies of hierarchical and distributed caching.

ISA Server Standard Edition

  • Provides firewall security and Web caching features for small business, departmental environments, and workgroups.

The following features are the same for both ISA Server editions

  • Security capabilities.
  • Caching capabilities.
  • Management capabilities.
  • Performance capabilities.
  • Extensibility capabilities.

The features available with the ISA Server Standard Edition is listed here

  • Firewall, caching, or integrated modes.
  • Hierarchical Caching.
  • Array Based Policy.
  • H.323 gatekeeper.
  • Intrusion detection.
  • Packet filtering.
  • Message Screener.
  • Web publishing.
  • Server publishing.
  • Bandwidth control.
  • Logging and reporting.

The features available in the ISA Server Enterprise Edition are listed here

  • Active Directory Integration.
  • Firewall, caching, or integrated modes.
  • Distributed Caching.
  • Hierarchical Caching.
  • Array Based Policy.
  • Enterprise Policy.
  • H.323 gatekeeper.
  • Intrusion detection.
  • Packet filtering.
  • Message Screener.
  • Web publishing.
  • Server publishing.
  • Bandwidth control.
  • Logging and reporting.

For each ISA Server edition, you can install ISA Server in either of these installation modes:

  • Firewall.
  • Caching.
  • Integrated.

The different server roles that you can configure for ISA Server are:

  • Dedicated firewall.
  • Secure Publishing server.
  • Forward Web cache server.
  • Reverse Web cache server.
  • Integrated Firewall and Web Cache server.

 

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