You suspect a network cable has a break in it somewhere. which tool would be best to use to determine the location of the break to determine if you are correct

The Optical Time Domain reflector

Explanation:

The Optical Time Domain

optical time-domain reflectometer is an optoelectronic instrument used to characterize an optical fiber. An OTDR is the optical equivalent of an electronic time domain reflectometer.

Reflectometer (OTDR) is useful for testing the integrity of fiber optic cables. It can verify splice loss, measure length and find faults. The OTDR is also commonly used to create a "picture" of fiber optic cable when it is newly installed

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