What is a Firewall?
A firewall is a system that is designed to prevent unauthorised access to private computers or networks. Firewalls can be implemented in hardware, or software. All data entering or leaving the computer must pass through the firewall. The purpose of the firewall is to allow the data you want to get through, like the web sites you’re looking at, or your email or the network games you are playing, while keeping hackers out.
A firewall is not that different from a proxy. A firewall again offers Internet access to lots of other computers on a network but is mostly deployed to provide safety or security; control over the information going in and out the network. Firewalls are used in business environments, at schools, universities and the like. Please keep in mind that most proxies and firewalls in use in business situations are there for a reason; to protect your work environment from the evil Internet. If your companies policy is to block IRC then stick to the rules, ok?
A firewall is a system designed to reinforce the security of the data flowing between two Networks: the Internal Network and the outside Network. There are several ways to accomplish this, but most firewalls use two or more of the following methods as none of them alone provides adequate security. •Packet Filtering: Works at the Internet protocol layer and enables you to accept, reject or drop packets based on IP Address, Ports or Protocols. Packet filters perform these duties based on a set of configurable rules called Policies. Packet filtering is the original and the most basic type of firewalling, and most routers provide packet filtering. Disadvantages of packet filtering, however, are: a) Address information on a packet can potentially be spoofed or falsified. b) The data contained in allowed packets can’t be checked, so they ultimately may contain exploits. c) Packet filters can’t provide application level or user level authentication. d) Once a particular protocol is allowed to
firewall is a piece of hardware or software that acts as a barrier between the Internet and your computer or network. Firewalls constantly scan the Internet connection for possible threats or intrusions and have the ability to block the source of the threat. So if someone is trying to hack into your computer from a location across the Internet, the firewall can detect the threat, and block all Internet traffic coming from or going to that location. There are two types of firewall Hardware firewalls come in the form of a router. If you have broadband, the router is the physical box that connects your computer to the outside world, either by telephone line or cable connection. Most routers that come with the broadband connection will have a built in firewall. The alternative type of firewall is a software firewall, which is usually installed on your PC. Advise you to have both forms of firewall. The more security you have, the better you chances against Internet threats. It is worth noti
A. A firewall (or Internet firewall) helps make your computer invisible to online attackers and some malicious software such as viruses, worms, and Trojan horses. A firewall can also help prevent software on your computer from accessing the Internet to accept updates and modification without your permission. Firewalls come in both software and hardware form, but hardware firewalls are intended for use in addition to a software firewall. It is important to have both a firewall and antivirus software turned on before you connect to the Internet. Read more about firewalls.
