what is firewall

Firewalls

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what is firewall

Postby theseopromotion » Fri Jul 04, 2008 12:18 pm

hi there...i am once agin ...can anyone tell me what is firewall
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Re: what is firewall

Postby Stephen » Sat Aug 23, 2008 2:30 am

A firewall is a dedicated appliance, or software running on another computer, which inspects network traffic passing through it, and denies or permits passage based on a set of rules.

A firewall's basic task is to regulate some of the flow of traffic between computer networks of different trust levels. Typical examples are the Internet which is a zone with no trust and an internal network which is a zone of higher trust. A zone with an intermediate trust level, situated between the Internet and a trusted internal network, is often referred to as a "perimeter network" or Demilitarized zone (DMZ).

A firewall's function within a network is similar to firewalls with fire doors in building construction. In the former case, it is used to prevent network intrusion to the private network. In the latter case, it is intended to contain and delay structural fire from spreading to adjacent structures.

Without proper configuration, a firewall can often become worthless. Standard security practices dictate a "default-deny" firewall ruleset, in which the only network connections which are allowed are the ones that have been explicitly allowed. Unfortunately, such a configuration requires detailed understanding of the network applications and endpoints required for the organization's day-to-day operation. Many businesses lack such understanding, and therefore implement a "default-allow" ruleset, in which all traffic is allowed unless it has been specifically blocked. This configuration makes inadvertent network connections and system compromise much more likely.


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Re: what is firewall

Postby annmacey » Sun Feb 14, 2010 2:03 am

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 other networks. (The term also implies the security policy that is used with the programs.) An enterprise with an intranet that allows its workers access to the wider Internet installs a firewall to prevent outsiders from accessing its own private data resources and for controlling what outside resources its own users have access to.

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Re: what is firewall

Postby RogerBlake » Thu Dec 16, 2010 11:29 pm

A system intended to put off unlawful access to or from a private network. Firewalls can be applied in both hardware and software, or a grouping of both. Firewalls are regularly used to avoid unofficial Internet users from accessing confidential networks connected to the Internet, especially intranets. All messages incoming or outgoing the intranet pass from side to side the firewall, which examines each message and blocks those that do not meet the specified security criteria.
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Re: what is firewall

Postby Sundaylove » Wed Mar 30, 2011 1:12 am

Without proper configuration, a firewall can often become worthless. Standard security practices dictate a "default-deny" firewall ruleset, in which the only network connections which are allowed are the ones that have been explicitly allowed. Unfortunately, such a configuration requires detailed understanding of the network applications and endpoints required for the organization's day-to-day operation. Many businesses lack such understanding, and therefore implement a "default-allow" ruleset, in which all traffic is allowed unless it has been specifically blocked. This configuration makes inadvertent network connections and system compromise much more likely.



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