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Question
What is the difference between S3 Standard, S3-IA, and S3 Glacier?
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Answer
Standard: frequent access, low latency, 99.99% availability. S3-IA (Infrequent Access): lower cost, retrieval fee, 99.9% availability. Glacier: archive storage, retrieval minutes-to-hours, lowest cost. Choose based on access frequency and retrieval latency needs.
Question
When should you use an Application Load Balancer (ALB) vs Network Load Balancer (NLB)?
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Answer
ALB: Layer 7, HTTP/HTTPS, path/host-based routing, WebSocket, Lambda targets — best for web apps. NLB: Layer 4, TCP/UDP, ultra-low latency, static IP, millions of req/sec — best for high-performance, non-HTTP workloads.
Question
What is the maximum size of an SQS message?
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Answer
256 KB. For larger payloads, use the SQS Extended Client Library to store the message body in S3 and pass a reference in the SQS message.
Question
What are the 5 pillars of the AWS Well-Architected Framework?
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Answer
1. Operational Excellence 2. Security 3. Reliability 4. Performance Efficiency 5. Cost Optimization (Mnemonic: "OSRPC" — Or Simply Remember Perfect Clouds)
Question
What is the difference between an IAM Role and an IAM Policy?
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Answer
Policy: a JSON document defining permissions (what actions are allowed/denied on which resources). Role: an IAM identity with policies attached that can be assumed by AWS services, users, or cross-account principals. Roles use temporary credentials (STS).
Question
What is RTO vs RPO in AWS disaster recovery?
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Answer
RTO (Recovery Time Objective): max acceptable downtime — how quickly you must restore. RPO (Recovery Point Objective): max acceptable data loss — how old the recovery point can be. Lower = more expensive. DR strategies: Backup & Restore → Pilot Light → Warm Standby → Multi-Site Active/Active.
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