Dyn interview question

1.debugging a Python program(related to type casting) 2. FizzBuzz problem 3.differences between Type 2 and Type 4.JDBC drivers 4.diff between TCP and UDP and If you are using an banking application which one do you use and why? 5.diff between thread and process 6.What is racearound condition in thread. 7. what is livelock and deadlock in a thread. 8.what is diff between primary key and foreign key. 9.how do you check disk space in an linux command line. 10.what is difference between proxy server and NAT?? 11.some database queries 12.what is abstract class.