Section: Core

21) What is one security function of a firewall?

1. Allows people on the Internet to see just one IP address.
   
2. Does not allow any connections to the server.
   
3. Restricts unauthorized users from accessing sensitive data.
   
4. Manages password functions.
   

At the most basic level, firewalls block traffic intended for particular IP addresses or server ports and they can do much more. However of the choices presented the management of password functions is the most relevant.

Exam Objective: 2.9 Compare and contrast network devices, their functions, and features.