ISA/IEC 62443 Cybersecurity Fundamentals Specialist — Question 16

In which layer is the physical address assigned?

Answer options

• A. Layer 1
• B. Layer 2
• C. Layer 3
• D. Layer 7

Correct answer: B

Explanation

The physical address is assigned at Layer 2, which is the Data Link layer of the OSI model. This layer is responsible for node-to-node data transfer and handles addressing through MAC addresses. The other layers, such as Layer 1 (Physical), Layer 3 (Network), and Layer 7 (Application), deal with different aspects of networking and do not assign physical addresses.