CERTIFIED-IN-CYBERSECURITY Question #561: Real Exam Question with Answer & Explanation

The correct answer is D: Layer 1. Firewalls do not control traffic on the physical layer (Layer 1) of the OSI model. The physical layer is responsible for sending and receiving raw bit streams over a physical medium, such as a cable. Firewalls do not operate at this layer. Firewalls operate at higher layers, wher

Network Security

Question

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

Options

ALayer 2
BLayer 7
CLayer 3
DLayer 1

Explanation

Firewalls do not control traffic on the physical layer (Layer 1) of the OSI model. The physical layer is responsible for sending and receiving raw bit streams over a physical medium, such as a cable. Firewalls do not operate at this layer. Firewalls operate at higher layers, where they can analyze and control network traffic based on IP addresses, port numbers, or application data. The other options are incorrect because firewalls can actually control traffic at Layer 2 (Data Link Layer), Layer 3 (Network Layer), and Layer 7 (Application Layer). Specifically, at Layer 2, firewalls can filter traffic based on MAC addresses. At Layer 3, firewalls can control traffic based on IP addresses and protocols. At Layer 7, firewalls can control traffic based on application data, such as HTTP requests or SMTP commands.

Topics

#OSI Model#Firewall#Network Security#Network Protocols

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