Systems Security Certified Practitioner (SSCP) — Question 22

Which of the following statements pertaining to firewalls is incorrect?

Answer options

• A. Firewalls create bottlenecks between the internal and external network.
• B. Firewalls allow for centralization of security services in machines optimized and dedicated to the task.
• C. Firewalls protect a network at all layers of the OSI models.
• D. Firewalls are used to create security checkpoints at the boundaries of private networks.

Correct answer: C

Explanation

Option C is the correct answer because firewalls primarily operate at the network layer and transport layer of the OSI model, not at all layers. The other options accurately describe the functions and characteristics of firewalls, such as creating bottlenecks (A), centralizing security (B), and establishing security checkpoints (D).