This is another operational question. The interviewer is interested in discovering if you have direct experience working with the types of networks they employ within their organization. You should know which networks these are based on the research you did about the organization and as technologies before coming to the interview. If you don't have experience in all of the network types, emphasize the ones you are skilled in, and then discuss how you will be able to learn about the other ones quickly if hired.
"I have direct experience working with networks of virtually every type. These include WANs, LANs, and wireless networks. I've also worked with public, private, and shared networks. I have good relationships with most of the leading network hardware and software vendors and can call on them if I have questions or encounter a situation I'm not familiar with. I am very confident I can deal with any network issue which may come up."