Screened Subnet Firewall

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.

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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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Margaret Rouse

Margaret Rouse is an award-winning technical writer and teacher known for her ability to explain complex technical subjects to a non-technical, business audience. Over the past twenty years her explanations have appeared on TechTarget websites and she's been cited as an authority in articles by the New York Times, Time Magazine, USA Today, ZDNet, PC Magazine and Discovery Magazine.Margaret's idea of a fun day is helping IT and business professionals learn to speak each other’s highly specialized languages. If you have a suggestion for a new definition or how to improve a technical explanation, please email Margaret or contact her…