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What is a Firewall? (Views: 1334)


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A firewall is a part of a computer system or network that isdesigned to block unauthorized access while permitting authorizedcommunications. It is a device or set of devices configured to permit,deny, encrypt, decrypt, or proxy all (in and out) computer traffic between different security domains based upon a set of rules and other criteria.

Firewalls can be implemented in either hardware or software, or acombination of both. Firewalls are frequently used to preventunauthorized Internet users from accessing private networks connectedto the Internet, especially intranets. All messages entering or leaving the intranet pass through the firewall, which examines each message and blocks those that do not meet the specified security criteria.

Submitted By: Anonymous | Created On: 7/19/2009 3:24:33 PM

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It allow only port number 80, 25 for work block msg on other port that can make break through in system

Submitted By: Anonymous | Created On: 7/24/2009 11:54:48 PM


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