At which layer of the OSI does a firewall NOT control the traffic?

The correct answer is D. Layer 1. Firewalls cannot control traffic at Layer 1 (Physical Layer) of the OSI model because this layer deals only with the physical transmission of raw bits over media (cables, fiber, radio signals). There is no concept of 'traffic control' at this layer - it is purely…

Network Security

Question

Options

ALayer 2
BLayer 7
CLayer 3
DLayer 1

How the community answered

(45 responses)

B
2% (1)
C
4% (2)
D
93% (42)

Explanation

Firewalls cannot control traffic at Layer 1 (Physical Layer) of the OSI model because this layer deals only with the physical transmission of raw bits over media (cables, fiber, radio signals). There is no concept of 'traffic control' at this layer - it is purely electrical/optical/electromagnetic signal transmission. Firewalls do operate at Layer 2 (packet filtering by MAC address), Layer 3 (IP-based filtering), Layer 4 (port/protocol filtering), and Layer 7 (application-aware/deep packet inspection). Layer 1 has no addressable or filterable unit of data.

Topics

#OSI Model#Firewall#Network Security#Network Protocols

Community Discussion

No community discussion yet for this question.

Full CERTIFIED-IN-CYBERSECURITY Practice