Welcome to your interview.
The question is on your right: DNS and GSLB Across Regions. 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.
How does DNS resolution work, and how can global server load balancing (GSLB) be used to route traffic across geographically dispersed data centers?