what is firewall ?

Question

how does it works and how to configure

Answer 1

A firewall protects a computer from external unauthorized attacks. It can be configured to allow access to connections authorised by the administrator of the computer. It works as a shield protecting the computer and prompting the user when an external attempt is made to connect to the PC.

Firewall also comes with antivirus software, depending on which one you plan to have.

Hence it is a total protection for the PC.

Answer 2

A firewall is an information technology security device which is configured to permit, deny or proxy data connections set and configured by the organization's security policy. Firewalls can either be hardware and/or software based.
Configuation hugely depends on the type of firewall and if software, the version.

Answer 3

A firewall is a set of related programs, located at a network gateway server, that protects the resources of a private network from users from other networks. (The term also implies the security policy that is used with the programs.) An enterprise with an intranet that allows its workers access to the wider Internet installs a firewall to prevent outsiders from accessing its own private data resources and for controlling what outside resources its own users have access to.
Basically, a firewall, working closely with a router program, examines each network packet to determine whether to forward it toward its destination. A firewall also includes or works with a proxy server that makes network requests on behalf of workstation users. A firewall is often installed in a specially designated computer separate from the rest of the network so that no incoming request can get directly at private network resources.

There are a number of firewall screening methods. A simple one is to screen requests to make sure they come from acceptable (previously identified) domain name and Internet Protocol addresses. For mobile users, firewalls allow remote access in to the private network by the use of secure logon procedures and authentication certificates.

A number of companies make firewall products. Features include logging and reporting, automatic alarms at given thresholds of attack, and a graphical user interface for controlling the firewall.

Computer security borrows this term from firefighting, where it originated. In firefighting, a firewall is a barrier established to prevent the spread of fire.

Answer 4

Firewall is a protection for your computer from cyberspace/internet. Theres plenty of viruses, pop ups out there that might harm your system. If you have the firewall protection enabled, your system is protected.

Read more information at this site:

http://en.wikipedia.org/wiki/Firewall

God bless

Answer 5

an integrated collection of security measures designed to prevent unauthorized electronic access to a networked computer system. A means of separating a computer network from outside networks for security purposes. A server outside an organization's own network may be used to funnel all incoming and outgoing traffic to assist in keeping out viruses, as well as to prevent unauthorized outsiders from gaining access to a network.

Answer 6

Firewall is a software it is a anti hacker software with this software the hack files can not conect to the internet hidden & send your computer information or your mail box information to hacker.

Answer 7

firewall is a softwere for accept data or deny unwanted data, protect hacking. when u purchase this softwere u will get guideline there.