| In the late 1980's when the Internet was still fairly new | | | | - 1. A proxy server while hiding the true network |
| and had not reached the global proportions of today, | | | | address, intercepts any messages which are arriving |
| firewall technology began to emerge. Previously | | | | and departing from the network. |
| routers were used for network security to separate | | | | - 2. Application gateways offer security functions for |
| one network from another. However the attitude that | | | | certain applications like Telnet servers and FTP. |
| the Internet was a small community of users who | | | | - 3. Packet filtering is reasonably effective as it |
| shared and collaborated and valued openness, came | | | | inspects any packet passing through your network and |
| to an end when major internet security breaches | | | | will reject or accept it according to user defined rules |
| occurred. | | | | - 4. Circuit-level gateway offers protection when a |
| Firewall technology continued to be developed. | | | | UDP or a TCP connection is established. Once the |
| So what is a firewall and what does it do? A firewall is | | | | connection is in place, packets can move steadily |
| a security device designed to block unauthorized | | | | between the hosts without the need for further |
| access to your computer system or network while | | | | checking. |
| allowing authorized communications. Firewalls can be | | | | Nowadays it is possible to obtain a high standard |
| carried out with either software or hardware or a | | | | firewall free of charge, and you may wish to |
| combination of both. Have you tried free antivirus | | | | complement it with a free antivirus software for |
| software for computer or top ten free antivirus | | | | computer. Investigate the top ten free antivirus |
| software? | | | | software. |
| Computer users install firewalls to prevent | | | | In conclusion, a firewall in other words is a shield placed |
| unauthorized internet visitors from accessing private | | | | between a protected network and an unprotected |
| networks connected to the Internet. All messages | | | | one. Its basic task is to monitor the flow of traffic |
| which come in or leave the intranet pass through this | | | | between networks with different levels of trust. |
| firewall. These messages are carefully inspected and | | | | Today's internet phenomenon represents a definite |
| if they fail to meet explicit security criteria, they are | | | | untrustworthy zone for the computer user, hence a |
| blocked. | | | | firewall of some description is mandatory. Once you |
| Several types of firewalls exist - - | | | | have installed it it needs to be kept up to date. |