Many things can affect the performance of a network. It could be something as small as a hardware failure, outdated software, downtime, or something more serious such as a security breach or network reliability issues. An interviewer that knows what a client needs are is going to ask specific questions that relate to the duties you will have as a consultant at a client site.
Here are a few things that you should research ahead of time, and be ready to answer. The interviewer will likely ask about your experience with the performance of hardware maintenance, how frequently you do software updates and when you run a performance analysis on the systems using network performance tools, assessments done of the reliability of the client network, downtime schedules, failure frequency, and unforeseen catastrophic failures. Research all these areas because these all affect the performance and reliability of a network.
