firewall


firewall
fire·wall (fīrʹwôl) n.
1. A fireproof wall used as a barrier to prevent the spread of fire.
2. Computer Science. Any of a number of security schemes that prevent unauthorized users from gaining access to a computer network or that monitor transfers of information to and from the network.
intr.v. Slang fire·walled, fire·wall·ing, fire·walls
To apply maximum acceleration or thrust. Used of motor vehicles or aircraft.

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Computer security system that controls the flow of data from one computer or network to another.

Firewalls are mainly intended to protect the resources of a private network from being directly accessed by a user from an external network, especially via the Internet. Users inside the private network may also be prevented from directly accessing external computers. To accomplish this, all communications are routed through a "proxy server" that determines whether a message or file will be allowed to enter or exit the private network.

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      type of system used to monitor connections between computer networks. One of the earliest responses to malicious activity perpetrated through the Internet, firewalls became a standard part of corporate, governmental, and personal networks.

      At its most basic, a firewall either permits or blocks a requested network connection—such as a World Wide Web site, an e-mail, or a file transfer—based on a set of policies determined by a network administrator or personal user. It is used to protect internal networks and private or sensitive data. A firewall also logs information about network traffic, which can help an administrator understand and prevent attacks.

      Typically, a firewall allows no direct connection between the internal network and the Internet. Instead, external connection requests, or digital packets, may be routed to a heavily secured “bastion host” server designed to withstand attack or to a larger “demilitarized zone,” a controlled network between the internal network and the outside. The firewall then evaluates the packet based on programmed security policies and decides whether to permit or deny access. A firewall can regulate access going either to or from the internal network; for instance, some companies use a firewall to block employee access to certain public Web sites.

      The first firewalls were developed in the 1980s at the American technology companies Cisco Systems and Digital Equipment Corporation. These “network layer” firewalls judged packets based on simple information such as their apparent source, destination, and connection type. Although fast and transparent, these systems were fairly easily foiled. In the early 1990s a new generation of “application layer” firewalls emerged; though more cumbersome to set up and operate, they performed a more thorough inspection. By the early 2000s most firewalls were hybrids of these two primary types.

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Universalium. 2010.

Look at other dictionaries:

  • Firewall — Firewall …   Deutsch Wörterbuch

  • FireWall-1 — is a firewall product created by Check Point Software Technologies Ltd. The FireWall 1 is a stateful firewall which also filters traffic by inspecting the application layer. It was the first commercially available software firewall to use… …   Wikipedia

  • FireWall-1 — FireWall 1/VPN 1 ist eine kommerzielle Firewall Software des israelischen Softwareherstellers Check Point. Es handelt sich um eine SPI Firewall, das bedeutet der Datenverkehr wird nicht nur anhand der Informationen auf OSI Ebene 3–4, sondern… …   Deutsch Wikipedia

  • Firewall-1 — FireWall 1/VPN 1 ist eine kommerzielle Firewall Software des israelischen Softwareherstellers Check Point. Es handelt sich um eine SPI Firewall, das bedeutet der Datenverkehr wird nicht nur anhand der Informationen auf OSI Ebene 3–4, sondern… …   Deutsch Wikipedia

  • Firewall-1 — / VPN 1 est une solution logicielle ou matérielle de pare feu édité par Check Point. FireWall 1 s inscrit dans une architecture réseau de type Zone démilitarisée (DMZ). Il se paramètre par un ensemble de règles définissant les protocoles… …   Wikipédia en Français

  • Firewall — Saltar a navegación, búsqueda El término Firewall puede referirse a: Cortafuegos (informática), un software utilizado en redes de computadoras para controlar las comunicaciones, permitiéndolas o prohibiéndolas. Firewall (película), una película… …   Wikipedia Español

  • firewall — n. A device or program that limits access to a computer network. The Essential Law Dictionary. Sphinx Publishing, An imprint of Sourcebooks, Inc. Amy Hackney Blackwell. 2008. firewall …   Law dictionary

  • FireWall-1 — / VPN 1 est une solution logicielle ou matérielle de pare feu éditée par Check Point. Premier pare feu informatique commercialisé en 1994[réf. nécessaire], FireWall 1 s inscrit dans une architecture réseau de type Zone démilitarisée (DMZ).… …   Wikipédia en Français

  • firewall — 1851 as a physical wall meant to prevent the spread of fire in a structure, from FIRE (Cf. fire) (n.) + WALL (Cf. wall). Computer sense is by 1990 …   Etymology dictionary

  • firewall — /ˈfairwol, ingl. ˈfaɪəˌwɔːl/ s. m. inv. (elab.) software di protezione …   Sinonimi e Contrari. Terza edizione

  • firewall — (izg. fàjervol) m DEFINICIJA int. sigurnosni sustav koji onemogućuje neovlašteni pristup nekom računalu ili mreži, te nadzire prijenos podataka ETIMOLOGIJA engl …   Hrvatski jezični portal


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