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MCSE : Security Specialist

Identify the purpose and benefits of using a firewall/proxy.

Firewall

A firewall is used to prevent unauthorized access to or from a network. They are frequently used to prevent unauthorized users from accessing private networks connected to the Internet, especially intranets. All messages entering or leaving the intranet pass through the firewall, which examines each message and blocks those that do not meet the specified security criteria.

Firewall techniques:

 

  • Packet filter looks at each packet entering or leaving the network and accepts or rejects it based on user-defined rules.
  • Application gateway applies security mechanisms to specific applications, such as FTP and Telnet servers.
  • Circuit-level gateway applies security mechanisms when a TCP or UDP connection is established. Once the connection has been made, packets can flow between the hosts without further checking.

 

 


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