Nokia Certified Network Professional – IP/MPLS Services — Question 45

What is an optical switch?

Answer options

• A. A device that selectively transfers an optical signal from one port to another.
• B. A device that groups multiple lambdas in one multiplexed signal.
• C. A device that selectively transfers an optical ODU frame from one port to another.
• D. A device that converts optical signal to electrical to allow switching through the electrical matrix, and then again to optical towards the next card (and versa).

Correct answer: A

Explanation

The correct answer, A, accurately describes an optical switch's function of transferring optical signals between ports. Option B refers to wavelength division multiplexing, which is not the primary function of an optical switch. Option C is too specific to ODU frames, while option D describes a process involving conversion between optical and electrical signals, which is not characteristic of a simple optical switch.