In my experience, it is not unusual at that company for an interviewer to have poor knowledge of the technical subject matter they are asking you about, and to

In my experience, it is not unusual at that company for an interviewer to have poor knowledge of the technical subject matter they are asking you about, and to be unaware of this fact. Amazon has some extremely bright engineers but, unlike some of the other tech companies, there quite apparently doesn't seem to be a quality floor either and you can be unlucky in an interview.