Global VOD content distribution
Design the CDN / content-distribution strategy for a global VOD service pushing tens of Tbps at peak, where 90% of bytes are a small catalog of popular titles but the long tail still matters. You want to serve most bytes from inside or adjacent to ISP networks to cut transit cost and improve QoE. Design the cache hierarchy, content placement/fill strategy, and how you decide what lives where, including handling a brand-new release that everyone wants at once.
What a strong answer looks like
Clarify scale and constraints first. Propose a clean component breakdown, then go deep on the hard parts (data model, bottlenecks, consistency, failure modes) and name the trade-offs you are making.
Clarify5:30 left
Estimate5:30 planned
Design16:30 planned
Deep dive13:30 planned
Failure9:00 planned
Which questions mattered is sealed until you submit. Telling you now would just be handing over the edge cases.
Run or narrate your approach, then ask the coach.