lecture26_inf201_fall2010

lecture26_inf201_fall2010 - IINF201 (Fall 2009) Intro. to...

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IINF201 (Fall 2009) Intro. to Info. Technologies Department of Informatics University at Albany – SUNY Fall 2009
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Firewall A security system consisting of a combination of hardware and software that limits the exposure of a computer or computer network to attack from hackers; commonly used on local area networks that are connected to the internet Definition from: wordnetweb.princeton.edu/perl/webwn Image from: http://en.wikipedia.org/wiki/File:Firewall.png
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Firewalls Firewalls can operate on many different levels of the OSI stack Each has strengths and weaknesses—The right choice depends on your organizational needs and budget Three major types of firewalls are: Packet Filtering Application Layer Stateful Inspection There are also hybrids and other newer, less common varieties
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Packet Filtering Firewall Inspects the packets moving between computers on the Internet. If a packet matches the firewall's set of rules, the
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lecture26_inf201_fall2010 - IINF201 (Fall 2009) Intro. to...

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