Overview Of Firewalls

I read papers and had a solid understanding of

OVERVIEW OF FIREWALLS

A Firewall is basically a security function which prevents our systems from attacks. That is it acts as wall between our system and remote attackers and makes it difficult for attackers to attack. It is set of related programs which is located at network gateway server which protects private networks from any other network users. . It is set of rules that determine whether packets are safe or not. It protects from viruses, worms and hackers who are trying to attack network through the Internet. Any computer in the world needs Firewall because these play a major role in keeping computer network secure and safe from attacks.

There are two main types of Firewalls one is Enterprise Firewall or Network Firewall and other is Host based Firewall. Two of these are generally used to secure the system by controlling the network traffic by allowing or denying them. Their primary function is to filter the traffic. Network Firewalls are used for protecting the perimeter of network Whereas Host based Firewall protects an individual computer regardless of the network it is connected to. The primary role of firewall is to enforce security policy.

Host based Firewall

Host based Firewalls are software Firewalls which runs on single host and filters the traffic coming to that system only. For example your laptop which can be connected to any network when you are out of your home but we don’t know it is secure or not during these times Host based Firewalls play main role by filtering the traffic. They prevent malicious attacks and protects host from getting infected. It also has some rules...

... middle of paper ...

...oped and their major innovation is application firewalls which blocks the attacks occur in application layer.

There are some disadvantages for firewall they are it cannot protect a system against backdoor attacks and cannot protect from inside attackers. The main problem comes that it deals with the Internet and which is not to be trusted as secure one. But Firewalls acts as barrier between the attackers and the system. Firewall does not deal with the real problems.

Today’s firewalls combine multilayer stateful packet inspection and multiprotocol application inspection. The virtualized network and advanced security tools shape them even better. At last the only thing is enterprise firewall is for entire network whereas host based firewall is for that particular host only. When we use both of these it leads to no compromise of security.