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1. www.cisco.com › firewalls › what-is-a-firewallWhat Is a Firewall? - Cisco

   www.cisco.com › firewalls › what-is-a-firewall

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   A firewall is a network security device that monitors and controls traffic based on security rules. Learn about different types of firewalls, such as proxy, stateful, UTM, NGFW, virtual, and cloud native, and their advantages.

2. en.wikipedia.org › wiki › Firewall_(computing)Firewall (computing) - Wikipedia

   en.wikipedia.org › wiki › Firewall_(computing)

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   In computing, a firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules. [1] [2] A firewall typically establishes a barrier between a trusted network and an untrusted network, such as the Internet .

3. builtin.com › articles › firewallWhat Is a Firewall? (Definition, Types, Examples) | Built In

   builtin.com › articles › firewall

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   Mar 28, 2023 · Learn how firewalls act as network security devices that monitor and control incoming and outgoing traffic. Explore the three types of firewalls: network, host-based and web application firewalls.

4. www.fortinet.com › resources › cyberglossaryWhat Is a Firewall? Definition and Types of Firewall | Fortinet

   www.fortinet.com › resources › cyberglossary

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   Learn what a firewall is, how it works, and the different types of firewalls based on operational method and delivery method. Explore the evolution of firewalls from antivirus protection to next-generation firewalls.

   • What is a firewall?

     A firewall is a network security solution that protects your network from unwanted traffic. Firewalls block incoming malware based on a set of pre-...
   • What are the types of firewalls?

     Web Application FirewallUnified Threat Management FirewallNetwork Address Translation FirewallsInternal Segmentation FirewallsNext-Generation Firew...
   • Why Are Network Firewalls Important?

     Without a network firewall, network security is compromised, and your organization is wide open to bad actors who could steal or compromise your da...

5. www.cloudflare.com › security › what-is-a-firewallWhat is a firewall? | Network firewalls | Cloudflare

   www.cloudflare.com › security › what-is-a-firewall

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   • Proxy-based firewalls: These are proxies* that sit in between clients and servers. Clients connect to the firewall, and the firewall inspects the outgoing packets, after which it will create a connection to the intended recipient (the web server).
   • Stateful firewalls: In computer science, a "stateful" application is one that saves data from previous events and interactions. A stateful firewall saves information regarding open connections and uses this information to analyze incoming and outgoing traffic, rather than inspecting each packet.
   • Next-generation firewalls (NGFW): NGFWs are firewalls that have the capabilities of traditional firewalls but also employ a host of added features to address threats on other layers of the OSI model.
   • Web application firewalls (WAF): While traditional firewalls help protect private networks from malicious web applications, WAFs help protect web applications from malicious users.

6. www.paloaltonetworks.com › cyberpedia › what-is-aWhat Is a Network Firewall? - Palo Alto Networks

   www.paloaltonetworks.com › cyberpedia › what-is-a

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   Learn what a network firewall is, how it works, and why it is important for network security. Explore the different types of network firewalls, such as packet filtering, stateful inspection, proxy, and next-generation firewalls.

7. www.paloaltonetworks.com › what-is-a-firewallWhat is a Firewall? | Firewall Definition - Palo Alto Networks

   www.paloaltonetworks.com › what-is-a-firewall

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   Learn what a firewall is, how it works, and the different types of firewalls. A firewall is a network security solution that monitors and regulates traffic based on defined security rules and protects the network from threats.