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  1. What is a firewall? - Cisco

    A firewall is a network security device that monitors traffic to or from your network. It allows or blocks traffic based on a defined set of security rules.

  2. What Is a Firewall? Definition and Types of Firewall | Fortinet

    Firewall Definition: What Is A Network Firewall? A firewall is a network security device designed to monitor, filter, and control incoming and outgoing network traffic based on predetermined …

  3. What is a Firewall? How Firewalls Work & Types of Firewalls

    Firewall – meaning and definition A firewall is a computer network security system that restricts internet traffic in to, out of, or within a private network.

  4. Firewall (computing) - Wikipedia

    Firewall (computing) In computing, a firewall is a network security system that monitors and controls incoming and outgoing network traffic based on configurable security rules. [1][2] A …

  5. What Is a Firewall? (Definition, Types, Examples) | Built In

    3 apr. 2025 · A firewall is a security device that monitors and regulates incoming and outgoing network traffic based on a set of rules. Here’s how firewalls work, their advantages, main types …

  6. What is a firewall in networking? | Cloudflare

    Firewalls protect networks by monitoring and controlling traffic based on defined rules. Learn what a firewall is, how it works, and explore key types.

  7. What is a firewall and why do I need one? - TechTarget

    19 mei 2025 · What is a firewall and why do I need one? A firewall is a network security device that prevents unauthorized access to a network by inspecting incoming and outgoing traffic …

  8. What Is a Firewall? [Definition & Explanation] - Palo Alto Networks

    A firewall is a network security solution that monitors and regulates traffic based on defined security rules and accepts, rejects or drops traffic accordingly.

  9. Firewall | Definition, Types, & Facts | Britannica

    Firewall, type of system used to monitor connections between computer networks. One of the earliest responses to malicious activity perpetrated through the Internet, firewalls became a …

  10. What Is a Firewall? - Definition | Proofpoint US

    A firewall is a type of network security system that analyzes incoming and outgoing network traffic, effectively serving as a barrier that blocks viruses and attackers based on …