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Screened Subnet Firewall

Definition - What does Screened Subnet Firewall mean?

A screened subnet firewall is a model that includes three important components for security. This type of setup is often used by enterprise systems that need additional protection from outside attacks.

A screened subnet firewall also called a 'triple-homed’ setup.

Techopedia explains Screened Subnet Firewall

A screened subnet firewall is built on other models including dual-homed gateways and screened host firewalls, which were developed for best practices in system security.

In a screened subnet firewall setup, the network architecture has three components.
  • The first is a public interface that connects to the global Internet.
  • The second is a middle zone, often called a demilitarized zone, that acts as a buffer.
  • The third is an additional subnet that connects to an intranet or other local architecture.

The additional third subnet helps to filter attacks or attract them to a particular network component to further protect the intranet. Some also claim that a screened subnet firewall can help with throughput and flexibility.

The use of an additional "layer" and other engineering aspects of the screened subnet firewall make it a good solution for many high traffic or high-speed traffic sites.

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