Which of the following statements pertaining to firewalls is incorrect?

The correct answer is C. Firewalls protect a network at all layers of the OSI models. Firewalls do NOT protect a network at all seven OSI layers. Packet-filtering firewalls operate at Layers 3 and 4 (Network and Transport). Stateful inspection extends Layer 4 analysis. Application-layer proxy firewalls can reach Layer 7. However, no single standard firewall…

Submitted by anjalisingh· Apr 18, 2026Network and Communications Security

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Options

AFirewalls create bottlenecks between the internal and external network.
BFirewalls allow for centralization of security services in machines optimized and
CFirewalls protect a network at all layers of the OSI models.
DFirewalls are used to create security checkpoints at the boundaries of private

How the community answered

(32 responses)

A
3% (1)
B
3% (1)
C
88% (28)
D
6% (2)

Explanation

Firewalls do NOT protect a network at all seven OSI layers. Packet-filtering firewalls operate at Layers 3 and 4 (Network and Transport). Stateful inspection extends Layer 4 analysis. Application-layer proxy firewalls can reach Layer 7. However, no single standard firewall covers all OSI layers simultaneously - physical layer (Layer 1) threats, certain data-link attacks (Layer 2), and sophisticated application-layer or encrypted threats can bypass firewall inspection. Statements A (firewalls create bottlenecks), B (firewalls centralize security services), and D (firewalls serve as checkpoints at network boundaries) are all accurate descriptions of firewall characteristics.

Topics

#Firewalls#Network Security Devices#OSI Model#Network Layers

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