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en.wikipedia.org/wiki/Firewall_(computing)

In computing, a firewall is a network security system that monitors and controls incoming and .... The firewall administrator may define the rules; or default rules may apply. The term "packet filter" originated in the context of BSD operating ...

searchsecurity.techtarget.com/definition/firewall

Nov 21, 2014 ... 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 ...

www.webopedia.com/TERM/F/firewall.html

A firewall is a security system designed to prevent unauthorized access on a private network. Firewalls can be implemented as hardware or software.

www.cisco.com/c/en/us/products/security/firewalls/what-is-a-firewall.html

A firewall is a network security device that monitors traffic to or from your network. It allows or blocks traffic based on a defined set of security rules.

www.dictionary.com/browse/firewall

Firewall definition, a partition made of fireproof material to prevent the spread of a fire from one part of a building or ship to another or to isolate an engine ...

kb.iu.edu/d/aoru

Nov 18, 2013 ... A firewall is a system designed to prevent unauthorized access to or from a ... the network and accepts or rejects it based on user-defined rules.

techterms.com/definition/firewall

Dec 18, 2014 ... The definition of Firewall defined and explained in simple language.

www.microsoft.com/en-us/safety/pc-security/firewalls-whatis.aspx

Learn about what a firewall is, how firewalls work, and how to help protect your computer with information from the Microsoft Security website.

en.oxforddictionaries.com/definition/firewall

Definition of firewall - a wall or partition designed to inhibit or prevent the spread of fire.