Cost-Aware Compute and Storage Selection
Cost questions test EC2 purchasing, Lambda, Fargate, S3 storage classes, lifecycle policies, EBS sizing, data transfer, and managed service tradeoffs.
How to study for AWS Solutions Architect Associate
Treat each question as an architecture tradeoff: identify security boundaries, failure modes, performance needs, data paths, and cost constraints before choosing services.
Core concepts
Concept 1
Cost-Aware Compute and Storage Selection questions reward architecture tradeoff reasoning rather than picking the most familiar AWS service.
Exam cue: Identify the workload requirement, failure mode, data path, access boundary, and operational constraint.
Concept 2
The best answer maps requirements to security, resilience, performance, and cost constraints before choosing services.
Exam cue: Match the AWS service to the Well-Architected pillar the scenario is testing.
Concept 3
Eliminate answers that ignore shared responsibility, single points of failure, data movement, scaling behavior, or total cost.
Exam cue: Prefer managed, durable, least-privilege, multi-AZ, and right-sized designs when requirements call for them.
Risk pitfalls and guardrails
Choosing the most powerful service when a simpler managed service satisfies the requirement.
Guardrail: Avoid answers that use broad permissions, public data paths, single-AZ state, overbuilt compute, or commitment pricing without predictable usage.
Solving performance while ignoring security, availability, or cost constraints stated in the scenario.
Guardrail: Avoid answers that use broad permissions, public data paths, single-AZ state, overbuilt compute, or commitment pricing without predictable usage.
Assuming one Availability Zone, public access, or manual operations are acceptable without justification.
Guardrail: Avoid answers that use broad permissions, public data paths, single-AZ state, overbuilt compute, or commitment pricing without predictable usage.
Memory anchors
Right Sizing
Right sizing matches resource type and size to actual workload requirements.
S3 Intelligent Tiering
S3 Intelligent-Tiering moves objects between access tiers when access patterns change.
S3 Lifecycle
S3 lifecycle rules transition or expire objects based on age and policy.
EBS Rightsizing
EBS volumes should match required capacity, IOPS, throughput, and snapshot needs.
Serverless Cost
Serverless can reduce idle cost for intermittent event-driven workloads.
Data Transfer
Data transfer patterns can materially affect architecture cost.
Managed Service
Managed services can reduce operational effort but should still match cost and control needs.
Spot Instance
Spot Instances can reduce cost for interruptible workloads.
On Demand
On-Demand pricing works for short-term, unpredictable, or no-commitment usage.
Storage Class
Storage class choice should match access frequency, retrieval time, resilience, and cost.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
A genomics batch workload runs on EC2, stores checkpoints in S3, and can resume after interruption. Jobs have flexible completion times and consume thousands of instance-hours. Which purchasing option should provide the largest savings?
A stateless web service has a stable minimum load and unpredictable daily bursts. It can tolerate loss of burst capacity but not of the baseline. Which Auto Scaling purchasing mix is most cost-effective?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
What is Pass Harbor?
Completely free exam prep for 317 U.S. exams.
- Practice questions
- Flashcards
- Study guides
- Mock exams
- No registration
- No paywall
- Start instantly
“No more expensive exam prep. Quality study tools should be accessible to everyone.”