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Firewall (computing) In computing, a firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules. A firewall typically establishes a barrier between a trusted network and an untrusted network, such as the Internet.

For the primary topic of firewalls, see Firewall (computing). In computing, a stateful firewall is a network-based firewall that individually tracks sessions of network connections traversing it. Stateful packet inspection, also referred to as dynamic packet filtering, is a security feature often used in non-commercial and business networks.

The Internet (or internet) [a] is the global system of interconnected computer networks that uses the Internet protocol suite (TCP/IP) [b] to communicate between networks and devices. It is a network of networks that consists of private, public, academic, business, and government networks of local to global scope, linked by a broad array of ...

A hardware security module ( HSM) is a physical computing device that safeguards and manages digital keys, performs encryption and decryption functions for digital signatures, strong authentication and other cryptographic functions. These modules traditionally come in the form of a plug-in card or an external device that attaches directly to a ...

Unsourced material may be challenged and removed. An application firewall is a form of firewall that controls input/output or system calls of an application or service. It operates by monitoring and blocking communications based on a configured policy, generally with predefined rule sets to choose from.

— The Mac Davis] ⌇☢ ญƛ. 05:06, 23 May 2006 (UTC) Sure dreams have 'meaning', just not necessarily very useful meaning. I know that when my Mum dreams about being chased by elephants she's been worrying about weight-loss again, when I dream about my teeth falling out I'm worrying about money, when I dream about rushing ahead of natural ...