Welcome to your interview.
The question is on your right: MongoDB vs Cassandra CAP Tradeoffs. Take a moment with it first.
Talk your thinking through with me if you like - when you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes). Discussion and graded submissions share your five interviewer interactions, so spend them well.
What are the key architectural differences between MongoDB and Cassandra, particularly regarding consistency, availability, and partition tolerance (CAP theorem)?