Chapter 5 · Networking and Content Delivery·v2.0.0·Updated 6/5/2026·~8 min
What's changed: Deepened SOA-C02 Chapter 5 to Associate depth (tables, scenarios, FAQ, traps; localized figures)
5.3Operating CloudFront and Load Balancing
Key points
Understand CloudFront edge caching (TTL, invalidation), ELB types (ALB/NLB) and health checks, and choosing between them in operations.
Delivering content fast and cheap and stably distributing traffic is where ops shines. Use CloudFront (CDN) and ELB (load balancing).
5.3.1CloudFront and ELB
- CloudFront: caches at the edge to cut latency and origin load; control freshness with TTL and force updates with invalidation.
- Choose between ALB (L7; HTTP path/host routing) and NLB (L4; ultra-low latency/high throughput).
- Health checks remove unhealthy targets, distributing only to healthy ones.
Exam point
Common on SOA: stale content served = check TTL or invalidation, HTTP path-based routing = ALB, ultra-low latency/static IP/TCP = NLB, fast static delivery = CloudFront + S3.
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