Google operates at a scale that changes standard assumptions.
Data volume: Google Search indexes hundreds of billions of pages. YouTube stores over million videos. Gmail serves billion users.
Global distribution: Data centers on continents. Latency between US and Asia is - ms.
Internal infrastructure: Borg (container orchestration, predecessor to Kubernetes), Bigtable (distributed storage), Spanner (globally consistent database), MapReduce/Colossus for batch processing.
Your interviewer expects you to reference scale-appropriate solutions, not single-server architectures.