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Network+ Training Guide by Mike Harwood, Drew Bird

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Firewalls

  • Identify the purpose, benefits, and characteristics of using a firewall.

Even though a firewall is considered a logical security measure, it deserves its own section because it is a specific objective for the Network+ exam.

A firewall is a system or group of systems that controls the flow of traffic between two networks. The most common use of a firewall is to protect a private network from a public network such as the Internet. However, firewalls are also increasingly being used as a means to separate a sensitive area of a private network from other, less-sensitive, areas of the private network.

At its most basic, a firewall is a device (it could be a computer system or a dedicated hardware device) that has more than one network interface ...

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