I got asked "What is my greatest professional achievement?" by almost every person I interviewed with. Either I kept doing poorly on it and they were asking because I failed the question in the previous interview, or it's extremely important them. Everything was pretty straight forward and they didn't try to catch me off guard.
given a network topology (which was quite a bit complex, drawn on white board), walk through the steps of how OSPF will communicate over the different networks, IP addresses were marked and the interviewer kept changing the topology all through in intervals.
Networking, TCP, VPN Scenario Based questions
What is the difference between a mutex and a semaphore?
C, C++ questions, socket programming logics
An entire spectrum of things were asked.
The most difficult portion of the process couldn't be defined by a single question. Instead I would highlight the entire panel interview. The panel did a great job of going around the room and diversifying the questions to keep topics varying. This forced me to continue to critically think about responses, instead of the standard expectation of interviews following a strict syllabus.
What are the 12 steps of troubleshooting?
Data communication questions
Discuss a time when things didn't go according to plan. How did you react/what did you do and what was the outcome?
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