Today’s internet or cyber space is largest information sharing network in the world. In fact every the non techie or average computer user in the world accessing this cyber space for now or the other, as it can educational, business or for any other corporate reason. But recent study raises eye bro of every security expert and security researchers when it comes to sharing data of information because data security or information security or even internet security is no longer safer these days.

Even connecting private network to internet can expose to information leakage of critical or confidential data to malicious attack form anywhere in the world. Ther fore every common user of internet or common cyber citizen should know about these security threats and dangers of cyber criminals as well as internet scammers. Thus protection of data and information with critical systems certainly is the need of the hour. Firewall security or implementing firewall is the need of the system.Firewalls can protect both individual computers and corporate networks from hostile intrusion from the Internet, but must be understood to be used correctly.
So lets welcome another security warrior against all security threats , “Firewall Security and Firewall technology best way of computer security which means a barrier or wall” . Thus firewall is smart security protection in terms of eradications of security threats in terms of internet .
What is firewall ?

Firewall as the name indicates ,set of related programs or integrated collection of measures located at local gateway server , to provide in authorized or unauthenticated access to a network computer syytem. In other terms it can be secuirty policy applied in terms of programs .Firewall can be hardare or it can be software.

A fire wall also supports or enables encryption technology i.e encrypt, decrypt, or proxy all computer traffic between different security domains based upon a set of rules and other criteria that makes network requests on behalf of workstation users.

Basic functions of firewall

Firewalls primarily provide access control for connections between networks. Usually this will be the connection between a corporate network and the Internet. For our security purposes we classify networks as either

1. Trusted: This is usually the corporate LAN. It is assumed that all PCs and

servers in the LAN are under your administrative control. If users are able to

change their IP address and install software .

2. Untrusted : The Public Internet, the Firewall’s WAN interface;

3 Partially trusted: The Firewall’s DMZ interface. These are machines under our control, but freely accessible from the Internet. These are not fully trusted because it is assumed that being accessible they will be compromised or hacked at some time.