ISA/IEC 62443 Cybersecurity Fundamentals Specialist — Question 10

Which is the PRIMARY responsibility of the network layer of the Open Systems Interconnection (OSI) model?

Answer options

• A. Forwards packets, including routing through intermediate routers
• B. Gives transparent transfer of data between end users
• C. Provides the rules for framing, converting electrical signals to data
• D. Handles the physics of getting a message from one device to another

Correct answer: A

Explanation

The network layer is primarily responsible for packet forwarding and routing through intermediate routers, making option A the correct choice. Options B, C, and D pertain to responsibilities of other layers in the OSI model, such as the transport layer, data link layer, and physical layer.