Firewalls
Firewalls are the technological barrier designed to prevent unauthorized or unwanted communications between computer networks or hosts. They were build to defend the corporate networks from any exploits. They are the first line of defense for every computer weather it is a personal or the corporate computer. So here is the question How it got started? and How this type of complex algorithm came into existence. Firewalls got particularly popular around 1996. This was the time where some new attack techniques emerged such as buffer overflows, remote exploits. Their primary goal was to provide traffic control and monitoring. They enforce the security policy represented by a set of rules, specifying what is explicitly permitted/denied. They usually interconnect two or more logical networks-public and a private ones. State of the art: They run as part of the OS kernel. They use some advanced algorithms for state-full traffic anal