SAA-C03 Q553 · Networking

Question

A company has developed an API using Amazon API Gateway REST API and AWS Lambda. How can latency be reduced for users worldwide?

Accepted Answer

Answer A combines three complementary latency-reduction techniques:

**1. Edge-optimized API endpoint:**
- Routes API requests through Amazon CloudFront's global edge network (200+ edge locations)
- Users worldwide connect to the nearest edge location instead of traveling all the way to the API Gateway's region
- This dramatically reduces network latency for geographically distributed users — the key requirement in this question

**2. API Gateway caching:**
- Caches API responses at the API Gateway level for a configurable TTL
- Subsequent identical requests are served from cache without invoking Lambda
- Reduces both latency (no Lambda cold/warm start) and cost (fewer Lambda invocations)

**3. Content encoding (compression):**
- Compresses response payloads using gzip before sending them

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