What does a firewall do?

Answer 1

Firewall is a piece of software that creates a barrier between internet and your PC.

In short, Firewall analyzes the traffic that goes from and to your computer and blocks such packets (traffic) that could hurt your computer.

Answer 2

Firewalls are network security software which act as a barrier between your computer and other networks. They filter networks before they enter your system. Networks which don't adhere to the rules programmed in the firewall are not allowed to enter the PC. Firewall follows packet filtering mechanism which scans the packets (collection of data) and allows them to pass or halt based on the source and destination Internet Protocol (IP) addresses, protocols and ports.

Reference source: personalfirewall.comodo.com

Answer 3

Lets say a firewall was is like a door (a two way door) You can chose who to let in and who to let out (who being a program or what ever). You do this by going to your firewall which is located in the control panel. There you can insert whow you want in or out in preferences under exceptioms. If it is not listed, you have the option to write it in. hope that helps.

Answer 4

It blocks traffic comming from the internet and stops traffic going to the internet. Without a firewall anybody could just pretty much send any sort of packets your way (or vice versa) and nothing is there to stop them.

Answer 5

A firewall is a part of computer system that blocks unauthorized access from accessing private networks connected to the Internet. Firewalls can be either hardware or software, or combination of both. All messages that enter or leave the intranet pass through the firewall, which inspects each message and blocks those that do not meet the specified security criteria. There are different types of firewall techniques like packet filter, application gateway, proxy server and circuit level gateway.

Answer 6

Firewall is an intermediate software, which acts between trusted network and untrusted network such as internet. Firewall uses packet filtering, application filtering mechanism to control the network flow passing in and out of the system.

There are two types of firewall. Software firewall and hardware firewall.

Software firewall: Software firewall is mainly opted for single system such as home system. Software firewall can be downloaded for free in the websites such as personalfirewall.comodo.com, which offers the best firewall security features.

Hardware firewall: Hardware firewall is a hardware device, which is mainly opted for a big organisation which contains many numb of systems. Hardware firewall uses packet filtering technique to monitor the source and destination of networks.

Answer 7

A firewall is a software or hardware which helps to check information from network and vice-versa network that prevents the computer hackers to enter into our Computer. It stops to allow unwanted websites vice versa. The following will help you understand more about firewall and why we need them in to our PC. Get them at https://personalfirewall.comodo.com/what-is-firewall.html.

Answer 8

Your computer's internal BIOS actually overheats slightly in order to kill any malware or intrusion RAT's. Basically like a fever except for computers.

Answer 9

Hardware or software used to protect data by determining what can get in and out of a network.