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What is a firewall In network security firewall is considered a first line of defense in protecting private information A firewall sits at the junction point or gateway between the two networks which are often a private network and a public network such as the Internet John V Harrison Hal Berghel 2004 A Protocol Layer Survey of Network Security It is a system designed to prevent certain access to or from another network It has two mechanisms and they are blocking or permitting accesses Why do I need a firewall Nowadays computers and internet become more and more popular companies and people will save their sensitive data or their little secrets which they want to protect on their computers However internet is not a safe place there are people who like to steal data from others or just enjoy ruining other peoples day by destroying others computer systems And firewall is used to protect you from those bad people and still letting you to get your job done The primary purpose of the firewall is to take a proactive and preventive measure approach to mitigating the numerous electronic security intrusions possible in todays Internet age University of Cincinnati 2005 Self Help Firewalls then provide the next level of protection by denying access to certain network services and ports based on policy and need Eugene H Spafford 2003 Cyber Terrorism The New Asymmetric Threat As we all know a company is rarely to have only a gate security to check a person who try to enter and without receptionist or other securities to check that person on the way in if it is reasonable to have layers of security in the company it is also reasonable to have layers of security on our network Some firewalls can also help to prevent others from using your computer to attack other computers without your knowledge Using a firewall is important no matter how you connect to
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