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A firewall cannot really protect you against threats inside your network. It cannot prevent individual users with modems from dialling into or out of the network, bypassing the firewall altogether. Employee misconduct or carelessness cannot be controlled by firewalls. A firewall cannot protect against hacking from within. A firewall is just another layer of security for things like:
Viruses that spread through e-mail, such as Trojan horses, which masquerade as helpful or benign software and trick you into opening or downloading them.
Trojan horses;...
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Firewall monitors all network traffic on the connections for which it is enabled. The firewall keeps track of all communications that have originated from your computer, and it prevents unsolicited traffic from reaching your computer.
If necessary, the firewall dynamically opens ports and allows your computer to receive traffic that you have specifically requested, such as a Web page for which you have clicked the address.
A “port” is a networking term that identifies the point at which a type of network traffic reaches your computer. The exact ports that you open depend...
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There are many creative ways that unscrupulous people use to access or abuse unprotected computers:
• Remote login - When someone is able to connect to your computer and control it in some form. This can range from being able to view or access your files to actually running programs on your computer.
• Application backdoors - Some programs have special features that allow for remote access. Others contain bugs that provide a backdoor, or hidden access, that provides some level of control of the program.
• SMTP session hijacking...
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A firewall is simply a program or hardware device that filters the information coming through the Internet connection into your private network or computer system. A firewall trusts nobody unless it is told otherwise. It secures your computer from the outside world. It helps protect computers inside a large company.
A company can set up rules like this for FTP servers, Web servers, Telnet servers and so on. In addition, the company can control how employees connect to Web sites, whether files are allowed to leave the company over the network and so on. A firewall gives a company tremendous...
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There are two general categories: hardware and software. Firewalls can be implemented in both hardware and software, or a combination of both.
Hardware Firewall
A hardware firewall is a box that sits between you and the internet that performs the filtering function. Traffic that is filtered out never reaches your computer. Broadband routers perform the function of a firewall quite nicely.
Software Firewall
A software firewall is a program that runs on your computer and at the very lowest level monitors your network traffic....
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If you have been using the Internet for any length of time, and especially if you work at a larger company and browse the Web while you are at work, you have probably heard the term firewall used. Basically, a firewall is a barrier unauthorized Internet users from accessing private networks connected to the Internet, especially intranets.
The term “fire wall” originally means a fireproof wall intended to prevent the spread of fire from one room or area of a building to another. A firewall’s purpose is...
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interesting info 
