While this question could stand alone, it may also be a follow-up to a previous question that asked you about the tools you use to manage network traffic. Interviewers like the ones at Cisco will ask follow-up questions immediately after the initial question or later in the interview. If asked immediately, they want more information about the topic. If asked later in the interview, the interviewer is looking to confirm that you're consistent in your answers during the interview. In either case, answering factually and truthfully will provide the interviewer with the information they seek and confirm that you're consistent in your answers.