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   What is a firewall & how does it work?

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

   Firewall (computing) - Wikipedia

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

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   What is a hardware firewall?

   • Often referred to as “network firewalls,” hardware firewalls are appliances placed at the perimeter of the network or network segment as a first line of defense. A hardware-based network firewall acts as a secure gateway at the network perimeter. It protects all devices and traffic beyond a specific point on the network, enabling broad scalability.

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

   www.fortinet.com/resources/cyberglossary/firewall

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   What is an example of a network-based firewall?

   • An example of a network-based firewall is a stateful inspection firewall that provides both access control and traffic inspection functionalities to ensure network security. A network firewall is a security device that filters traffic between a trusted internal network and untrusted external networks.

   What Is a Network Firewall? - Palo Alto Networks

   www.paloaltonetworks.com/cyberpedia/what-is-a-network-firewall

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   What is a network firewall?

   • The first reported type of network firewall is called a packet filter, which inspects packets transferred between computers. The firewall maintains an access-control list which dictates what packets will be looked at and what action should be applied, if any, with the default action set to silent discard.

   Firewall (computing) - Wikipedia

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

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

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   • Proxy firewall. An early type of firewall device, a proxy firewall serves as the gateway from one network to another for a specific application. Proxy servers can provide additional functionality such as content caching and security by preventing direct connections from outside the network.
   • Stateful inspection firewall. Now thought of as a “traditional” firewall, a stateful inspection firewall allows or blocks traffic based on state, port, and protocol.
   • Unified threat management (UTM) firewall. A UTM device typically combines, in a loosely coupled way, the functions of a stateful inspection firewall with intrusion prevention and antivirus.
   • Next-generation firewall (NGFW) Firewalls have evolved beyond simple packet filtering and stateful inspection. Most companies are deploying next-generation firewalls to block modern threats such as advanced malware and application-layer attacks.

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

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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.

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

   builtin.com › articles › firewall

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   Mar 28, 2023 · A firewall is a network security device that monitors and controls incoming and outgoing traffic from a computer network. By allowing only authorized traffic and blocking unwanted traffic, firewalls protect against unauthorized access, malware and other security threats.

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

   www.fortinet.com › resources › cyberglossary

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   A firewall is a network security device designed to monitor, filter, and control incoming and outgoing network traffic based on predetermined security rules. The primary purpose of a firewall is to establish a barrier between a trusted internal network and untrusted external networks.

   • 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...

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

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   A network firewall is a security device that filters traffic between a trusted internal network and untrusted external networks. Network firewalls operate by inspecting incoming and outgoing data packets against a set of security rules and permitting or denying passage.

9. www.kaspersky.com › definitions › firewallWhat is a Firewall? How Firewalls Work & Types of Firewalls

   www.kaspersky.com › definitions › firewall

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   A firewall is a network security system that restricts internet traffic in or out of a private network. Learn how firewalls work, what types of firewalls exist, and how they protect your devices and data.