Systems Security Certified Practitioner (SSCP) — Question 33

At which layer of ISO/OSI does the fiber optics work?

Answer options

• A. Network layer
• B. Transport layer
• C. Data link layer
• D. Physical layer

Correct answer: D

Explanation

The correct answer is D, as fiber optics operate at the Physical layer of the ISO/OSI model, which involves the transmission of raw bit streams over a physical medium. Options A, B, and C refer to higher layers that deal with routing, data transfer protocols, and framing, respectively, and do not pertain to the physical transmission of signals.