Describe the top 3 gotchas of using traceroute to
diagnose network problems. 
That's something you're not likely to look up if you're
in the middle of a connectivity event....
Yes, but it's different to knowing stuff by heart that you can just research. Note that I do not mention any specific search tool, I barely even use the largest search engines.
The "top 3 gotchas of using traceroute" is something I would expect to be part of basic skills that someone with at least mid level knowledge in the field would possess. But how exactly traceroute does its thing is something I personally like to read about but not remember word for word.
Greetings,
Jeroen