ISA/IEC 62443 Cybersecurity Fundamentals Specialist — Question 91

Which is a role of the application layer?

Answer options

• A. Includes protocols specific to network applications such as email, file transfer, and reading data registers in a PLC
• B. Includes user applications specific to network applications such as email, file transfer, and reading data registers in a PLC
• C. Provides the mechanism for opening, closing, and managing a session between end-user application processes
• D. Delivers and formats information, possibly with encryption and security

Correct answer: A

Explanation

The correct answer, A, accurately describes the application layer's role in handling protocols for network applications. Options B and C misrepresent the focus on user applications and session management, respectively, while option D refers to aspects more relevant to the transport layer.