More importantly, you don't know what you don't know. If you don't have something in memory, even though that knowledge is readily available on the web, you probably won't notice an opportunity to apply that knowledge. That said, while I can answer these questions, they are pretty specialized knowledge. It's is a common phenomenon to think that the specialized area you work in is a big part of the world because you spend so much time in it. People should not feel bad about not knowing the answers to these questions. A web developer doesn't need to know any of these things, and he would be able to come up with web development questions that would be equally hard to answer if don't happen to be in that area (e.g. In which browsers is css-property-foo supported? or: what is faster, setting innerHTML or inserting a new elment into the DOM?). Even within the area of computer science, the author is asking specialized questions about hardware, security and algorithms. If it was about machine learning, type systems, and parsing you'd have a completely different set of questions. Or it could have been about computer graphics, compiler optimization, human computer interaction, and programming languages.