A firewall is
A) A list of permissions attached to specified objects
B) The process of defining, implementing, and maintaining password policies throughout an enterprise
C) A form of protection that allows one network to connect to another network while maintaining some amount of protection
D) Passwords on the system known to unauthorized users

Question

Quizplus · Accepted Answer

A firewall is a form of protection that allows one network to connect to another network while maintaining some amount of protection. It serves as a barrier between a trusted internal network and untrusted external networks, such as the Internet, by monitoring and controlling incoming and outgoing network traffic based on predetermined security rules. 
Option A is referring to access control lists. Option B is referring to password management. Option D is a security vulnerability.

A Firewall Is