Give an explanation of the definition of the word "firewall" in connection to network security, as well as how it is utilized in a variety of different network topologies, and include why it is necessary.

Management Of Information Security
6th Edition
ISBN:9781337405713
Author:WHITMAN, Michael.
Publisher:WHITMAN, Michael.
Chapter12: Protection Mechanisms
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Give an explanation of the definition of the word "firewall" in connection to network security, as well as how it is utilized in a variety of different network topologies, and include why it is necessary.

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