Final answer:
The best tool for determining where a network cable terminates in the wiring closet is a cable tester.
Step-by-step explanation:
The technician can use a cable tester to determine where a network cable terminates in the wiring closet. A cable tester is specifically designed to check the connectivity and integrity of network cables. It can identify if a cable is properly terminated and detect any faults or breaks in the cable.
For example, if the technician connects one end of the cable tester to the network cable in the wiring closet and the other end to a network device, the cable tester can indicate if there is a successful connection between the two ends of the cable. This helps the technician locate where the cable terminates in the wiring closet.
Using a cable tester is more suitable than other tools mentioned in the question like a multimeter, crimper, or screwdriver because those tools do not provide the specific functionality required to determine the termination point of a network cable.