What is Firewall Firewall is actually a system of security for the computers using the network connections either for the internet or for any other purpose. It prevents the unauthorized access from any sort of private computer to your own network. Firewalls can be installed in the computer in both ways either as hardware or software or sometimes used as a combination. It is required for the prevention of the trespassing of ones private networking connected to the internet, especially involving the use of the intranet. The working criteria of the firewall is such that every data transmission of the internet first passes through the firewall system and only those messages which pass a certain security criteria are allowed to get through; otherwise the other data is blocked, making it inaccessible for the unauthorized users. The firewall involves several different techniques one of them is the Packet filter. This is a simple technique of security for the firewall system. It keeps a check on the packets which enter and leave your computer network and then verifies them according to rules previously defined by your network user so as to allow or reject their passage through the network. The packet filtering is transparent to the network users, but its configuration is difficult and requires professional help. The other firewall techniques include the Application gateway, which is targeted to specific programs such as the FTP, followed by the Circuit-level gateway which is required for the TCP and the UDP connections. And lastly the Proxy servers, which is most commonly used these days for the internet security system. Firewall is actually considered to be the primary and the first line of defense for the security reasons.
Thanks for this valuable stuff. Firewall give us security for viruses ,unwanted authorization etc. It have lot of features.
A firewall is a network security system that protects network resources by filtering messages at the application layer.
Firewall is used to define the set of rules for network traffic. It is either software or hardware. It stops the un-trusted traffic. You can define set of rules in your way so you can stop the attacks or hack attempts on your server. If your servers's bandwidth is utilized by the un-authorized IP addresses then you can block such traffic. You can block the particular port in the firewall so no one can access it. You have option to allow IP or deny IP in firewall that is either allow those IP addresses to access your network or particular port or disallow them to access them some features on the server. The blocks will be automatically removed after some time as per the rule set in firewall. Firewall is the best option to secure your server.
