Firewalls

Paper Summary:

This paper discusses firewall technology. It describes the purpose of firewalls and looks at how they have evolved over time from simple packet-filtering devices to ones that have multiple purposes. The paper discusses how firewalls are used and looks briefly at the different forms that firewalls come in. The paper also looks at how to choose a firewall for your given network security situation.

From the Paper:

"Each of the layers of the OSI Reference Model only has communication with the layer directly above and below it. As data from another computer comes off the wire at the Physical Layer (Layer 1) and travels up to the Data Link Layer (Layer 2), information is added as a header to the information packet that is needed by the Network Layer (Layer 3). This process continues, layer by layer, until the packet reaches the Application Layer (Layer 7). This is where the program you are running on your computer is able to use the data and you, as an end user, get the result you were expecting. Conversely, if your program needs to communicate with another computer on the network, the process is done in reverse fashion as the data packet descends through the layers of the OSI model."

Sample of Sources Used:

• Garfinkel, S., & Spafford, G. (1996). Practical UNIX and Internet Security (2nd ed.). North Carolina: O'Reilly.
• Hudson, K., Novosel, G., & Stewart, J. M. (1999). Exam cram MCSE TCP/IP Adaptive testing edition. North Carolina: Certification Insider Press.
• Odom, W. (2000). Cisco CCNA Certification Guide. North Carolina: Cisco Press.

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