Nokia Certified Network Professional – IP/MPLS Services — Question 27

WDM allows transmission systems to:

Answer options

• A. Transport multiple signals transparently, onto several wavelengths, all together over one single fiber
• B. Increase the bit rate of each client signal by spreading it over multiple wavelengths
• C. Share a single signal among multiple fibers doing load balancing, and thus increasing the reliability of the optical transmission
• D. Allocate different signals to different time slots

Correct answer: A

Explanation

The correct answer is A because Wavelength Division Multiplexing (WDM) allows multiple signals to be transmitted simultaneously over different wavelengths on a single optical fiber. The other options incorrectly describe WDM functions, as B suggests increasing bit rates through wavelength distribution, C talks about load balancing across fibers which is not a WDM function, and D relates to time division, which is not applicable to WDM.