Most of the time, it's a pretty straightforward task to troubleshoot a cable issue. If you have formal training from a past employer, you can discuss what you learned. Maybe you have troubleshot problems at home with your current cable provider. Or, perhaps you are very tech savvy and naturally know what to do.
Discuss what you believe to be the most critical steps to troubleshooting a cable-related technical issue. This question will also show the interviewer if you are a proactive problem-solver. Do you try to tackle the problem, or do you shrug your shoulders?