1. VPC Peering vs Transit Gateway
Question: When would you use VPC Peering vs Transit Gateway in AWS?
VPC Peering: Simple, 1:1 connection between two VPCs. Non-transitive.
Transit Gateway: Hub-and-spoke model for connecting many VPCs and on-prem networks. Simplifies management at scale.
2. S3 Consistency Model
Question: What is the consistency model of Amazon S3?
S3 now provides strong read-after-write consistency for all requests.