What is "firewall"

also fire-wall, 1851 as a physical wall meant to prevent the spread of fire in a structure, from fire (n.) + wall (n.). Computer sense (originally figurative) is by 1990.

n. 1 A fireproof barrier used to prevent the spread of fire between or through buildings, structures, electrical substation transformers, or within an aircraft or vehicle. 2 (context computer security English) The software that monitors traffic in and out of a private network or a personal computer and allows or blocks such traffic depending on its perceived threat. vb. 1 (context transitive computer security English) To protect with a firewall. 2 (context transitive computer security English) To block with a firewall. 3 (context intransitive motor vehicles or aircraft, slang English) To use maximum acceleration.

1. n. the application of maximum thrust; "he slammed the throttle to the firewall"

2. (computing) a security system consisting of a combination of hardware and software that limits the exposure of a computer or computer network to attack from crackers; commonly used on local area networks that are connected to the internet

3. fireproof (or fire-resistant) wall designed to prevent the spread of fire through a building or a vehicle

A firewall is a fire resistant barrier used to prevent the spread of fire for a prescribed period of time. Firewalls are built between or through buildings, structures, electrical substation transformers, or within an aircraft or vehicle.

Firewall is a crime novel by Swedish author Henning Mankell.

Firewall may refer to:

• Firewall (construction), a barrier inside a building or vehicle, designed to limit the spread of fire, heat and structural collapse
• Firewall (engine), the part of a vehicle that separates the engine compartment from the rest of the vehicle
• Firewall (computing), a technological barrier designed to prevent unauthorized or unwanted communications between computer networks or hosts
  • Personal firewall, a very popular form of firewall designed to protect personal computers
• Firewall (physics), a hypothetical phenomenon where a freely falling observer spontaneously burns up at the horizon of a black hole
• Firewall, the alias of Lange (musician) (born 1974)
• Firewall (film), a 2006 thriller film written by Joe Forte, starring Harrison Ford
• Firewall (Henning Mankell novel), a 1998 novel by Henning Mankell, featuring Kurt Wallander
• Firewall (Andy McNab novel), a Nick Stone adventure
• Firewall (G.I. Joe), a fictional character in the G.I. Joe universe
• "Firewall", a song by Steve Vai off his Real Illusions: Reflections album
• Chinese wall, a zone of non-communication between distinct sections of a business, in order to prevent conflicts of interest
• Great Firewall, China's internet censorship firewall
• The Alberta Agenda, also known as the Alberta Firewall, a political proposal for the Canadian province
• "Firewall", an episode of the computer animated series ReBoot

Firewall is a 2006 American-Australian crime thriller film directed by Richard Loncraine and written by Joe Forte. The film stars Harrison Ford as a banker who is forced by criminals, led by Paul Bettany, to help them steal $100 million. The film was a box office disappointment and received negative reviews from critics.

In automotive engineering, a firewall is the part of the bodywork that separates the engine from the driver and passengers.

It is most commonly a separate component of the body, or in monocoque construction, a separate steel pressing, but may be continuous with the floorpan or its edges may form part of the door pillars.

The name originates from steam-powered vehicles. The firewall would separate the driver from the fire heating the boiler.

In aviation, a firewall on an aircraft serves a similar purpose to that of a motor vehicle. In single-engine aircraft it is the part of the fuselage that separates the engine compartment from the cockpit. "Put the throttle to the firewall" refers to setting the engine to run at maximum speed. In most multi-engine propeller aircraft the firewall typically divides the nacelle from the wing of the aircraft, or divides the nacelle into two zones.

Category:Aircraft components

In computing, a firewall is a network security system that monitors and controls the incoming and outgoing network traffic based on predetermined security rules. A firewall typically establishes a barrier between a trusted, secure internal network and another outside network, such as the Internet, that is assumed not to be secure or trusted. Firewalls are often categorized as either network firewalls or host-based firewalls. Network firewalls are a software appliance running on general purpose hardware or hardware-based firewall computer appliances that filter traffic between two or more networks. Host-based firewalls provide a layer of software on one host that controls network traffic in and out of that single machine. Firewall appliances may also offer other functionality to the internal network they protect such as acting as a DHCP or VPN server for that network.

A black hole firewall is a hypothetical phenomenon where an observer that falls into an old black hole encounters high-energy quanta at (or near) the event horizon. The "firewall" phenomenon was proposed in 2012 by Ahmed Almheiri, Donald Marolf, Joseph Polchinski, and James Sully as a possible solution to an apparent inconsistency in black hole complementarity. The proposal is sometimes referred to as the AMPS firewall, an acronym for the names of the authors of the 2012 paper. The use of a firewall to resolve this inconsistency remains controversial as of 2013, with high-energy physicists divided as to the solution to the paradox.Astrophysics: Fire in the hole!