What percentage of your time do you spend on the following: Network Architecture, Software and Hardware selection, Network Optimization (including upgrades,) User Support, and Administrative Tasks? How would you change this to better use your time?

This is an operational question in which the interviewer is seeking to understand your work habits and patterns. They may have some preconceived notion of how your time should be spent. A good way to respond to this question is directly and honestly. You should also be prepared for follow-up questions which will clarify what you're doing when performing each of the functions the interviewer has asked about.

"This is an interesting question, which I don't often think about. My best estimate is the following: I spend the majority of my time defining the network architecture and optimizing the network performance. Combined, these probably occupied 50% of my day. The next biggest component is user support which takes about 25% of my time. Administrative tasks probably represent about 15%, and the remaining 10% is spent on hardware and software selection."