No individual has all the answers for every issue they are likely to encounter in the organization's computer environment. This becomes even more challenging as the IT environment evolves and new technologies are incorporated. Thankfully, with the advent of the internet, this has become much easier. Systems engineers can now do online searches for the issues they encounter and quickly find answers. The interviewer is hoping to learn by asking this question that you are both able to do this and that you already have a portfolio of resources you use for this purpose. This latter point will help you resolve issues quicker and with less online time than if you have to do a unique search each time.