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

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

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   Firewall (computing) 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]

2. 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.

3. People also ask

   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 a network based firewall?

   • Firewalls are categorized as a network-based or a host-based system. Network-based firewalls are positioned between two or more networks, typically between the local area network (LAN) and wide area network (WAN), their basic function being to control the flow of data between connected networks.

   Firewall (computing) - Wikipedia

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

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   What is the role of a firewall in cyber security?

   • The function of a firewall is to secure network hosts by monitoring and managing traffic flow. Network hosts are devices (e.g., computers) that communicate within a network. Their exchanges can be within an internal network or between internal and external networks. The role of a firewall in cyber security is paramount.

   What is a Firewall? | Firewall Definition - Palo Alto Networks

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

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4. 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. Firewalls come in both hardware and software forms, and they ...

   • A firewall is a network security solution that protects your network from unwanted traffic. Firewalls block incoming malware based on a set of pre-...
   • Web Application FirewallUnified Threat Management FirewallNetwork Address Translation FirewallsInternal Segmentation FirewallsNext-Generation Firew...
   • 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. 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. Firewalls can also prevent sensitive data from leaving the network.

6. 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.

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

   www.kaspersky.com › definitions › firewall

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   Learn what a firewall is, how it works, and what types of firewalls exist. A firewall is a network security system that filters web traffic based on rules and protocols.

8. 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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   A firewall is a network security solution that regulates traffic based on specific security rules. It scrutinizes data packets, deciding whether to allow, block, or drop them based on established criteria. The primary purpose is to protect network devices by monitoring traffic flow and blocking potential threats.