Service Comparison

Lambda vs ECS/Fargate vs EC2

All run compute, but control and operational overhead vary.

What They Have in Common

Each option can solve part of the scenario. The exam expects you to choose the one that satisfies the stated constraints with the right operational burden, security boundary, availability model, and cost behavior.

Key Differences

Option	Primary model	Best use	Security
Lambda	Functions	Event-driven short-lived code	Least server ops, runtime limits
ECS/Fargate	Containers without server management	Containerized services/jobs with managed compute	Task definitions and service config
EC2	Virtual machines	Full OS control and custom agents	Highest management burden

Typical Exam Clues

Practice After Studying

Return to the certification guide that includes this comparison and launch domain training from there.

Sources and Review Metadata

AWS service documentation https://docs.aws.amazon.com/ Reviewed 2026-08-07

AWS Well-Architected Framework https://docs.aws.amazon.com/wellarchitected/latest/framework/welcome.html Reviewed 2026-08-07

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