Enterprise-Grade IT Security for Small and Medium Businesses: Building Security Systems, in Plain English

© The Author(s), under exclusive license to APress Media, LLC, part of Springer Nature 2022

D. CherryEnterprise-Grade IT Security for Small and Medium Businesseshttps://doi.org/10.1007/978-1-4842-8628-9_3

3. Firewalls

Denny Cherry¹  

(1)

Denny Cherry & Associates Consulting, LLC, Oceanside, CA, USA

 

A firewall is a hardware appliance or software package that is designed to prevent users from accessing a computer, network, or endpoint. Just like their physical namesake in a car or a building, where the firewall exists to stop fire and/or heat from moving from one place to another, a computer firewall is designed to stop data from moving from one place to another.

What Do Firewalls Do?

The primary responsibility of a firewall is to stop network traffic ...