CCNA: Cisco Certified Network Associate — Question 1053

What is a function of a firewall on an enterprise network?

Answer options

• A. It allows and denies ingress and egress traffic.
• B. It serves as a default gateway to hosts on the internet.
• C. It processes traffic based on stateless inspection.
• D. It acts as the intermediary device between the enterprise and its ISP.

Correct answer: A

Explanation

The correct answer, A, highlights the primary function of a firewall, which is to control the flow of incoming and outgoing traffic based on security rules. Option B is incorrect because a firewall typically does not serve as a default gateway; that function is usually handled by routers. Option C is wrong as it describes a specific type of inspection that not all firewalls use, and D is incorrect because while firewalls can manage traffic between an enterprise and its ISP, they are not typically described as intermediary devices.