4.0 Design Cost-Optimized Architectures SAA-C03 Practice Quiz

• A. S3 storage classes let architects match object storage cost to access pattern, retrieval time, and durability requirements.
• B. S3 lifecycle policies transition or expire objects automatically to reduce storage cost as access patterns change over time.
• C. S3 Glacier storage classes provide lower-cost archival storage for data that is accessed infrequently and can tolerate retrieval delay.
• D. S3 Intelligent-Tiering automatically moves objects between access tiers when access patterns are unknown or changing.

S3 storage classes let architects match object storage cost to access pattern, retrieval time, and durability requirements. This is the correct answer.

• A. AWS DataSync cost-effective transfer moves data between on-premises storage and AWS services with managed transfer features when that fits workload needs.
• B. S3 lifecycle policies transition or expire objects automatically to reduce storage cost as access patterns change over time.
• C. AWS Storage Gateway cost fit supports hybrid storage when on-premises applications need access to cloud-backed file, volume, or tape storage.
• D. EC2 purchasing options include On-Demand Instances, Reserved Instances, Savings Plans, Spot Instances, and Dedicated Hosts for different cost and commitment needs.

S3 lifecycle policies transition or expire objects automatically to reduce storage cost as access patterns change over time. This is the correct answer.

• A. Reserved Instances is the best fit when the cost-optimized AWS architecture requires this design behavior: Reserved Instances reduce cost for steady-state usage in exchange for a term commitment.
• B. S3 storage classes is the best fit when the cost-optimized AWS architecture requires this design behavior: S3 storage classes let architects match object storage cost to access pattern, retrieval time, and durability requirements.
• C. Savings Plans is the best fit when the cost-optimized AWS architecture requires this design behavior: Savings Plans reduce compute cost in exchange for a commitment to consistent usage over a term.
• D. Spot Instances is the best fit when the cost-optimized AWS architecture requires this design behavior: Spot Instances reduce cost for interruption-tolerant workloads by using spare EC2 capacity that AWS can reclaim.

S3 storage classes let architects match object storage cost to access pattern, retrieval time, and durability requirements. This matches the cost-optimized architecture scenario without confusing storage, compute, database, network, backup, transfer, or purchasing choices. This is the correct answer.

• A. Load balancer cost fit is the best fit when the cost-optimized AWS architecture requires this design behavior: Load balancer cost fit means selecting ALB, NLB, or Gateway Load Balancer only when its traffic behavior and feature set justify its cost.
• B. Cost-optimized database selection is the best fit when the cost-optimized AWS architecture requires this design behavior: Cost-optimized database selection chooses the database service, engine, capacity mode, and deployment model that meet workload needs at lowest practical cost.
• C. S3 lifecycle policies is the best fit when the cost-optimized AWS architecture requires this design behavior: S3 lifecycle policies transition or expire objects automatically to reduce storage cost as access patterns change over time.
• D. DynamoDB capacity modes is the best fit when the cost-optimized AWS architecture requires this design behavior: DynamoDB capacity modes let architects choose on-demand or provisioned capacity based on traffic predictability and cost goals.

S3 lifecycle policies transition or expire objects automatically to reduce storage cost as access patterns change over time. This matches the cost-optimized architecture scenario without confusing storage, compute, database, network, backup, transfer, or purchasing choices. This is the correct answer.

• A. VPC endpoint cost optimization is the best fit when the cost-optimized AWS architecture requires this design behavior: VPC endpoint cost optimization can reduce data transfer through public paths and improve private access to AWS services when traffic patterns justify it.
• B. NAT gateway cost strategy is the best fit when the cost-optimized AWS architecture requires this design behavior: NAT gateway cost strategy balances availability and cost when deciding between one shared NAT gateway and NAT gateways in multiple Availability Zones.
• C. CloudFront cost optimization is the best fit when the cost-optimized AWS architecture requires this design behavior: CloudFront cost optimization can reduce origin load and data transfer costs while improving latency through edge caching.
• D. S3 Glacier archival is the best fit when the cost-optimized AWS architecture requires this design behavior: S3 Glacier storage classes provide lower-cost archival storage for data that is accessed infrequently and can tolerate retrieval delay.

S3 Glacier storage classes provide lower-cost archival storage for data that is accessed infrequently and can tolerate retrieval delay. This matches the cost-optimized architecture scenario without confusing storage, compute, database, network, backup, transfer, or purchasing choices. This is the correct answer.

• A. A design points to Database read replicas cost tradeoff when the cost, usage pattern, commitment, retention, or data-transfer requirement depends on this distinction: Database read replicas can improve read performance but add cost, so they should match read-scaling or availability requirements.
• B. A design points to Database backup retention cost when the cost, usage pattern, commitment, retention, or data-transfer requirement depends on this distinction: Database backup retention cost depends on how long snapshots or backups are kept and whether retention exceeds business requirements.
• C. A design points to S3 storage classes when the cost, usage pattern, commitment, retention, or data-transfer requirement depends on this distinction: S3 storage classes let architects match object storage cost to access pattern, retrieval time, and durability requirements.
• D. A design points to Database caching cost optimization when the cost, usage pattern, commitment, retention, or data-transfer requirement depends on this distinction: Database caching cost optimization uses cache services when reducing repeated database reads lowers load or avoids larger database capacity.

S3 storage classes let architects match object storage cost to access pattern, retrieval time, and durability requirements. This distinction matters because choosing a nearby concept would lead to the wrong storage tier, compute purchase model, database capacity choice, network path, or retention strategy. This is the correct answer.

• A. A design points to S3 storage classes when the cost, usage pattern, commitment, retention, or data-transfer requirement depends on this distinction: S3 storage classes let architects match object storage cost to access pattern, retrieval time, and durability requirements.
• B. A design points to S3 Glacier archival when the cost, usage pattern, commitment, retention, or data-transfer requirement depends on this distinction: S3 Glacier storage classes provide lower-cost archival storage for data that is accessed infrequently and can tolerate retrieval delay.
• C. A design points to S3 Intelligent-Tiering when the cost, usage pattern, commitment, retention, or data-transfer requirement depends on this distinction: S3 Intelligent-Tiering automatically moves objects between access tiers when access patterns are unknown or changing.
• D. A design points to S3 lifecycle policies when the cost, usage pattern, commitment, retention, or data-transfer requirement depends on this distinction: S3 lifecycle policies transition or expire objects automatically to reduce storage cost as access patterns change over time.

S3 lifecycle policies transition or expire objects automatically to reduce storage cost as access patterns change over time. This distinction matters because choosing a nearby concept would lead to the wrong storage tier, compute purchase model, database capacity choice, network path, or retention strategy. This is the correct answer.

• A. EFS storage classes is the correct architecture choice when the cost-optimization decision depends on this exact meaning: EFS storage classes reduce file storage cost by matching file access patterns to standard or infrequent-access tiers.
• B. Amazon FSx cost fit is the correct architecture choice when the cost-optimization decision depends on this exact meaning: Amazon FSx cost fit means choosing a managed file system only when the workload needs its specific Windows, Lustre, ONTAP, or OpenZFS capabilities.
• C. AWS Backup cost strategy is the correct architecture choice when the cost-optimization decision depends on this exact meaning: AWS Backup cost strategy balances recovery requirements, retention periods, and backup frequency to avoid unnecessary backup spending.
• D. S3 storage classes is the correct architecture choice when the cost-optimization decision depends on this exact meaning: S3 storage classes let architects match object storage cost to access pattern, retrieval time, and durability requirements.

S3 storage classes let architects match object storage cost to access pattern, retrieval time, and durability requirements. This applies the concept at the point where a solutions architect must choose a cost design that still meets performance, availability, retention, and business requirements. This is the correct answer.