An application firewall is a form of firewall that controls input, output and access from, to, or by an application or service. It operates by monitoring and potentially blocking the input, output or system service calls that do not meet the configured policy of the firewall. The application firewall is typically built to control all network traffic on any OSI layer up to the application layer. It is able to control applications or services specifically, unlike a stately network firewall which is without additional software-unable to control network traffic regarding a specific application.

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There are two primary categories of an application firewall which are:

  • Network-based application firewalls
  • Host-based firewalls

Network-Based Application Firewalls

This network –based application layer firewall is a …

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