Amazon Network Development Engineer I interview questions

First there were two phone interviews, one hour each. They covered technical aspects of BGP, OSPF and TCP. After that, there was a on-premises white board type of interview. Five of them. One after another for 5 hours in total.

5 hour interview without break. interesting questions but repeated again and again for 5 hours. At some point they come to a point where there is no answer to questions which they are trying to make up.