Firewall Terms

Port knocking is a technique for externally opening ports that by default, the firewall keeps locked.

A personal firewall is a software app that monitors and manages network traffic going to and coming from a computer or other device.

A perimeter firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules.

A hybrid firewall is a network security system that merges features from various kinds of firewalls.

A host-based firewall is a firewall installed directly on an individual device, rather than on a whole network.

FWaaS, or firewall as a service, is a cloud-based security solution that helps organizations protect their applications and data from unauthorized access and cyberthreats.

A firewall is a cybersecurity tool that monitors network traffic, blocks malicious activity, and prevents unauthorized access.

Firewall rules are policies used in network security to control network traffic.

A dual-homed host is an application-based firewall that protects trusted networks (e.g., a corporate network) from malicious traffic.

A DNS firewall is a protection measure that filters and controls DNS traffic to prevent users on a specific DNS network from accessing malicious or unwanted websites or resources.

Distributed firewalls are a network security solution that applies firewall policy to all devices in a network.

A circuit-level gateway is a network security device that operates at the transport layer of the OSI model.

An application firewall is a cybersecurity tool that protects applications from layer attacks, such as SQL injection, cross-site scripting (XSS), or cookie poisoning.