Computer firewalls are programs or hardware devices that filter information coming through internet connections into your computer system or network. When an incoming packet of data is flagged by the filtering system, it is not allowed through to the network. A firewall software creates an intelligent barrier that protects you from internet threats that want to reach your network or computer system.
The program maintains a safe opening for only legitimate traffic. The firewall technology started in the 1980s when the pioneering firewalls filtered packets of data that comprised the traffic flowing over computer networks such as the internet. The packet filtering firewalls allow for checking of communication packets to see if they match the set rules.
Packet filtering makes an assumption that computer devices are using standard port numbers for activities such as email transmission and web browsing. If you have a computer device that is using non-standard ports, the packet filtering becomes ineffective. As the technology develops, there have been improvements on the packet filtering system where awareness of the state of packet was introduced.
With the state of the packet, the filtering system is able to know whether the packet is in a flow of packets that are associated with an existing internet connection or a new connection. It also identifies if the packet is or is not part of any connection. There is also the third generation firewall, which brought intelligence among the application layer of Open Systems Interconnection-OSI model.
With a firewall, a company is able to place security rules at every connection in their network. For example, out of 100 computers in a company, the administrator may set the firewall in such a way that only one computer is allowed to receive public FTP traffic. A company can also set similar rules for web servers, Telnet servers, and FTP servers. Besides, a company is able to control the way in which employees connect to the websites, and how files are allowed to leave the company over a network.
There are three methods that are used by firewalls to control traffic flowing in and out of networks. One is packet filtering where small chunks of data are critically analyzed using a set of filtering rules. A second method is proxy service where a firewall retrieves information from the internet and sends it to the requesting system. The third method is the stateful inspection where certain key parts of the data packet are examined.
If you are searching for a firewall program, you should ensure that it is able to perform impeccably well. Through the independent test labs, you can measure the performance of a firewall and know whether it will offer you the protection and service you need in your network. It is important that you have additional security considerations bundled together in the firewall product.Sponsored Links
The best firewall will be able to protect your system and computer from incoming threats and also block outgoing threats from malware, which had successfully infiltrated your network. A good firewalls is that which constantly scans your computers including the ports and detects threats. It is able to know when it is under attack.
A firewall applies certain rules to packets of data it has seen so as to enforce its policies. It knows when to allow and discard traffic. If it detects illegal traffic coming from suspicious connections, it applies the filters in order to allow through only traffic that is defined as legal.