Why is it practical?
Why is Lamport's solution not practical?
What is the leader (primary)?
What is a view?
What is a view change?
There is a normal operation without a view change. It has 3 phases. What do the 3 phases do? 
Who is the client?
What is a replica?

In which model does this algorithm operate? Synchronous, asynchronous? (no easy answer)