Amazon Software Engineer interview questions

First I get two phone interviews. In the phone interviews, they asked me a lot questions about c/c++. Because I have a lot of experience about Unix network programming. They ask me something about tcp/udp and thread programming. For the onsite interview, they ask me something about design pattern, and how to design a phonebook. They also asked something about shell programming. It is not very hard. but you need to ask hints and make sure whether your idea is correct. : )