ACM

External CA Certs on ALB Rotation | SAA-C03

5 January 2026·1166 words·6 mins

Architecture Drills AWS SAA-C03 FinOps Decision Matrix ACM ALB Certificate Management EventBridge

Analyzing the critical decision between ACM’s automation capabilities and the reality of external CA requirements - a common SAA-C03 trap that tests understanding of certificate lifecycle management constraints.

API Gateway Domain Cert Region Choice | SAA-C03

2 January 2026·1017 words·5 mins

Architecture Drills AWS SAA-C03 FinOps Decision Matrix API Gateway ACM Route 53 Custom Domain HTTPS

A critical analysis of API Gateway custom domain configuration, focusing on the regional vs. edge-optimized endpoint decision and the often-overlooked ACM certificate region requirement that trips up SAA candidates.

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