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Why Do You Need a Firewall?

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kind of firewall protection. This chapter tells you what a firewall does and ... worms denialofservice (DoS) attacks hacking and breakins. ...

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Why Do You Need a Firewall?Page 1Chapter 1Why Do You Need a Firewall?In This ChapterUnderstanding what a firewall doesConnecting to the InternetFiguring out Internet protocolsUnderstanding how a firewall worksIdentifying hackersSetting rulesIf you want to find out about firewalls you bought the right book. Beforewe start exploring the gory details of how firewalls work and how to configure them we use this chapter to lay the groundwork. If you are already familiar with how the Internet works and how you connect to it and if you have abasic understanding of firewalls then you can skip this chapter. If these topicsare new to you if you want to refresh your knowledge of any of these topicsor if you want to get an overview of what a firewall is then read on.Defining a FirewallA firewall is a piece of software or hardware that filters all network trafficbetween your computer home network or company network and theInternet. It is our position that everyone who uses the Internet needs somekind of firewall protection. This chapter tells you what a firewall does andsets down the basic questions that you should ask as you are evaluating specific firewalls.Not too long ago only construction workers and architects asked the question Why do we need a firewall? Before the term firewall was used for acomponent of a computer network it described a wall that was designed to04 540483 Ch01.qxd 5/28/03 9:26 AM Page 9Page 2contain a fire. A brick and mortar firewall is designed to contain a fire in onepart of a building and thus prevent it from spreading to another part of thebuilding. Any fire that may erupt inside a building stops at the firewall andwont spread to other parts of the building.A firewall in a computer network performs a role that is very similar to thatof a firewall in a building. Just as a firewall made out of concrete protectsone part of a building a firewall in a network ensures that if something badhappens on one side of the firewall computers on the other side w ...

Source: media.wiley.com

 

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