What is Usefulness of firewall?

Answer 1

Each computer that is connected to the internet (and, more generally, to any computer network) is likely to become a victim of a computer attack by a hacker. The methodology generally used by hackers consists in scanning the network (by randomly sending out data packets) in search of a connected computer. Once a computer is found, the hacker searches for a security weakness in order to exploit it and access the data on the machine. For several reasons, this threat is even greater when the machine is permanently connected to the Internet: * The targeted machine is likely to be connected but not monitored * The targeted machine is generally connected with a greater bandwidth * The targeted machine does not change or rarely changes IP addresses Therefore it is necessary for both company networks and Internet users with cable or ADSL connections to protect themselves from network intrusions by installing a protection device. A firewall is a system that protects a computer or a computer network against intrusions coming from a third-party network (generally the Internet). A firewall is a system that filters data packets that are exchanged over the network. Therefore, it is a filtering gateway that comprises at least the following network interfaces: * an interface for the network being protected (internal network) * an interface for the external network the site to use http://en.kioskea.net/contents/protect/firewall.php3

Answer 2

The use of firewall is to stop people from hacking onto your computer or cheating on games.