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A stateless web tier sits behind an ALB across 3 AZs. The team wants to remove ANY single point of failure. Which of these still represents a SPOF in this architecture?
ARoute 53 alias records pointing to the ALB
BThe CloudFront distribution in front of the ALB
CMultiple Auto Scaling Group launch templates
DA single-AZ Amazon RDS database that the web tier reads/writes
Answer & Solution
Correct answer: D. A single-AZ Amazon RDS database that the web tier reads/writes
A single-AZ RDS is the SPOF — if that AZ fails the DB is unreachable. The web tier (ALB across 3 AZs) is resilient; ASG launch templates aren't a SPOF; Route 53 and CloudFront are multi-Region by design.
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