What is Firewall?

[stuartspindlow2]

Hello Friends,

Please tell me what is firewall.

[RH-Calvin]

A firewall is a network security system designed to prevent unauthorized access to or from a private network. Firewalls can be implemented in both hardware and software, or a combination of both.

[Dam Ponting]

It uses rules to control incoming and outgoing network traffic.

[manoharparakh]

Firewall is a security system which protect the System from Intruders and hackers. Firewalls also safeguards the PC from offensive software that come to reside on the software to stole the user personal data.

It is a software programs or hardware tool which notes and filters the traffic that flow into the PC through Internet connection. They block the files which are harmful to the system. There are set of rules to connect such as who to connect to the internet, what kind of connections can be made to the internet, what kind of files may be transferred. These Rules are can be set up by yourself or by administrators to allow traffic to their web servers, FTP and Telnet servers, thereby giving the computer owners/administrators control over the traffic that flows in & out of the systems.

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[MarcS]

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 internal network and untrusted external network, such as the Internet.

Firewalls are often categorized as either network firewalls or host-based firewalls. Host-based firewalls run on host computers and control network traffic in and out of those machines.

[Juliaalan]

A firewall is software or firmware that enforces a set of rules about what data packets will be allowed to enter or leave a computer network. A firewall's main purpose is to filter traffic and lower the risk that malicious packets traveling over the public internet will be able to impact the security of a private network.

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[Akshay_M]

In a normal way Firewall means a wall or partition designed to inhibit or prevent the spread of fire. In computing way firewall is a wall and shield that protect a network or system from unauthorized access via outer.

Firewall is a security system which protects the System from Intruders and hackers. It is a network security device that keeps an eye on incoming and outgoing traffic and stop and slowdown viruses and malware to spread from one computer or sub net or network to another.

Firewall uses a define set of rules and terms for checking and filtering packet. Firewall security device filter outgoing and incoming traffic and only allows that traffic which fulfill all rules. Firewall decides whether to allow or block specific traffic according to security rules.

Example-You could think of a firewall as a security guard that decides who enters or exits a building.

Example- You could also think of a firewall as airport security. Only authorized person can go to take a flight. A person can go inside only when he/she pass all security checks

Firewall can divide into two categories- A firewall is a software utility or hardware device that acts as a filter for data entering or leaving a network or computer.

Hardware: Basically the router is used for hardware firewalls but any other security product can also use. Hardware firewall is placed between your PC and the outside world. Router and Security device can connect more than one device at a time. It is a tangible product or devices that secure system and PC from outer threads, viruses, malware and many more harmful viruses.

Software Firewall: Software firewall is an intangible product. Software Firewall is a program and set of codes that install in computer or system. In case of attack software firewall hide open ports and will deflect incoming attacks. Software Firewall also aware and warn from suspicious outgoing traffic. When software firewall present in a system an attacker will have to cross two level securities to access your PC and it’s too difficult for any attacker.
Firewall support services are like a back bone for every system and network. Firewall can secures and protects network of both sides, client sides and server sides and deliver only useful content.

[lishmalinyjames]

A firewall is a security device — computer hardware or software — that can help protect your network by filtering traffic and blocking outsiders from gaining unauthorized access to the private data on your computer. Firewalls can provide different levels of protection.