I will be going for an interview on Markov Chains and Queuing Theory.

If anyone has any good questions or tips on what I should definitely have covered or on the tips of my fingers, I would appreciate if you would let me know.

These could include Conceptual Questions, Problems and basic things which are usually asked in viva voce and written exams to test the person's understanding of the subjects (basics and fundamentals which a student is required to know).

Problems in communications networks will be most appreciated, but general ones will also do.

Again, Think like an interviewer for a research position in networking.
Do not just list tough problems or knowledge facts which is only written in one particular book which you may have read.

An interviewer for a research position in networking will most likely ask general questions and conceptual stuff about markov chains and queuing theory with reference to a general or commonly asked problem to see if you know your basics and fundamentals.

Or, at least I hope they do.

The reason I am asking for this is because, with reference to these 2 subjects, I am self taught.