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....
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....
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....
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 “firewall” 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 very simple: to block or filter people from accessing your computer remotely or viruses and worms infecting your machine. Its basic task is to regulate some of the flow of traffic between computer networks of different trust levels. Some firewalls will also monitor outgoing traffic for suspicious behavior. One characteristic of many viruses is that once you’re infected they attempt to establish connections to other computers to spread....
There are two general categories: hardware and software. Firewalls can be implemented in both hardware and software or a combination of both.
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....
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 control over how people use the network....