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An Application Load Balancer (ALB) makes intelligent routing decisions at Layer 7 (HTTP headers, URL paths); a Network Load Balancer (NLB) routes at Layer 4 (ultra-low latency TCP/UDP).

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Aug 12, 2026

Quiz: What does an Auto Scaling Group (ASG) do when traffic surges on an application?

An Auto Scaling Group dynamically adjusts instance count to maintain steady performance during traffic spikes and reduce costs during quiet periods.

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Aug 12, 2026

Quiz: How do Amazon RDS Read Replicas improve database performance?

Read Replicas allow read traffic (SELECT queries) to be handled by replica instances, freeing the primary database to handle write transactions.

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Aug 12, 2026

Quiz: What kind of database model is Amazon DynamoDB?

Amazon DynamoDB is a serverless NoSQL database designed for high-throughput applications requiring fast, predictable single-digit millisecond response times.

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Aug 12, 2026

Quiz: In Disaster Recovery planning, what does "RPO" (Recovery Point Objective) measure?

RPO defines the maximum age of data that can be lost when unexpected disaster strikes (how recent your backups must be).

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Aug 12, 2026

Quiz: What is the primary purpose of Amazon ElastiCache in high-scale web applications?

Amazon ElastiCache accelerates application performance by caching frequently accessed data in sub-millisecond in-memory stores like Redis and Memcached.

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