A firewall is a safe and trusted machine that be seated among a private network and a public network. Firewalls are used to connect a company local network to the Internet and as well as inside the networks. Firewalls can be created in relatively a variety of ways. There are several types of firewall methods like Packet filter were it is quite effective and clear to users, but it is difficult to configure. Application gateway it is very useful, but can enforce performance degradation. Circuit-level gateway Applies security mechanisms when a TCP connection is established.
Proxy server will interrupt all messages entering and leaving the network. Firewall will increase the safety and being protected our computer and contents. It is quite reasonable priced or free for personal use. We can monitor incoming and outgoing security alerts, Depending on the severity Firewall will record and track down an interruption effort. Some firewalls can detect viruses, worms, Trojan horses, or data collectors. Firewall also cause some disadvantages like it change due to cracker’s aptitude. Firewalls cannot protect our PC from interior damage within a network or as of it allows other users to access our PC.