Question #3:   What is a firewall?

A firewall is a system that is designed to prevent unauthorized access to private computers or networks. Firewalls can be implemented in hardware, like the DI-701, or software. All data entering or leaving the computer must pass through the firewall. The purpose of the DI-701 is to allow the data you want to get through, like the web sites you're looking at, or your email or the network games you are playing, while keeping hackers out.

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