Internet Firewalls

The Internet is a complex web of interconnected servers and workstations that span the globe, linking millions of people and companies. But there is a dark side: The convenient availability of valuable and sensitive electronic information invites severe misuse in the form of stolen, corrupted, or destroyed data found therein. Compounding this problem is the unfortunate fact that there are ample opportunities to intercept and misuse information transmitted on the Internet. For example, information sent across telephone lines can not only be seen, but also can be easily manipulated and retransmitted, or software can be developed to do something as fundamental as deny Internet service. ...

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consuming process made all the easier by programs which systematically try all character combinations until the correct one is eventually generated. User-IDs and passwords can also be trapped by finding security holes in programs; a person looking to abuse the Internet finds these holes and uses the information leaked through them for his or her own personal agenda. Even someone who has been entrusted with high-level network access, such as a system administrator, can misuse his or her authorization to gain access to sensitive areas by impersonating other users.

Eavesdropping - By making a complete transcript of network activity, sensitive data such as passwords, data, and procedures for performing certain functions can be obtained. Eavesdropping is can be accomplished through the use of programs that monitor the packets of information transmitted across the network; or, less often, by tapping network circuits in a manner similar to telephone wiretapping. Regardless of ...

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access to corporate and personal information. These instances do occur and care should be taken to guard against them. This is the function of a firewall: To provide a barrier between an Internet server and anyone intent on invading its sensitive data.

Countering the Threat with a Firewall
As the name implies, an Internet Firewall is a system set up specifically to shield a Web site from abuse and to provide protection from exposure to inherently insecure services, probes, and attacks from other computers on the network. A Firewall can be thought of as a pair of mechanisms: one, which exists to block traffic, and the other that exists to permit traffic. Some firewalls place a greater ...

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Internet Firewalls. (2004, November 17). Retrieved December 15, 2018, from
"Internet Firewalls.", 17 Nov. 2004. Web. 15 Dec. 2018. <>
"Internet Firewalls." November 17, 2004. Accessed December 15, 2018.
"Internet Firewalls." November 17, 2004. Accessed December 15, 2018.
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Added: 11/17/2004 10:04:03 PM
Category: Science & Nature
Type: Premium Paper
Words: 2823
Pages: 11

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