CompTIA Network+ Question A-42

A network technician has configured a point-to-point interface on a router, however, once the fiber optic cables have been run, the interface will not come up. The technician has cleaned the fiber connectors and used an optical power meter to confirm that light is passing in both directions without excessive loss. Which of the following is the MOST likely cause?

A. Distance limitation
B. Wavelength mismatch
C. cross-talk
E. Macro bend

Correct Answer: B