what is the purpose of Firewall?

Answer 1

## The main purpose of a Firewall is to prevent unauthorized access between networks.

Generally this means protecting a site's inner network from the Internet. If a site has a firewall, decisions have been made as to what is allowed and disallowed across the firewall. These decisions are always different and always incomplete, given the multiplicity of Internet, there are always loopholes where a cracker can capitalize on.

A firewall basically works by examining the IP packets that travel between the server and the client. This provides a way to control the information flow for each service by IP address, by port and in each direction.

A firewall embodies a "stance". The stance of a firewall describes the trade-off between security and ease-of-use. A stance of the form "that which is not expressly permitted is prohibited" requires that each new service be enabled individually and is seldom used, coz very slow and annoying.

Other firewall general responsibilities/ purposes:

1. First and foremost if a particular action is not allowed by the policy of the site, the firewall must make sure that all attempts to perform the action will fail.
2. The firewall should log suspicious events.
3. The firewall should alert internal administration of all cracking attempts.
4. Some firewall provide usage statistics as well.

Answer 2

A system designed to prevent unauthorized access to or from a private network. Firewalls can be implemented in both hardware and software, or a combination of both. Firewalls are frequently used to prevent unauthorized Internet users from accessing private networks connected to the Internet, especially intranets. All messages entering or leaving the intranet pass through the firewall, which examines each message and blocks those that do not meet the specified security criteria

Answer 3

To protect you from people that think it is fun to destroy all the files on your computer or even use your computer to destroy other peoples computers...

If you have a router, it will act as a firewall and block incoming requests (unless you have it set not to), but you will also need a software based firewall on your computer to keep malicious programs from getting out on the web.

Answer 4

"What is the purpose of Firewall?"

The REAL purpose of Firewall is to SHOW its domain name or even just IP of who’s connecting or those already to your computer. ONLY then (with your knowledge) will allow or block them to connect.

It’s really very good to have one, not much relying on Windows (Windows XP) Firewall…

Answer 5

Gateway that limits access between networks in accordance with local security policy. So that your computer can be miles away from hackers, trojans, intruders etc.

Answer 6

Protect and "segment" yourself (and your network) from external intruders (Internet, extranet, etc.) in general.

It also could check through intranet as well for irregularities and activities.

Answer 7

To show people just how useful an iPod can be.

I'd still rather have a PSP, though.

Answer 8

to block hackers or unwanted people snooping into your networks

Answer 9

to block hackers or unwanted people snooping into your networks

Answer 10

to prevent any program or person from accessing your computer, sending data to and/or from your computer without your permission or knowing.