AWS Billing, Pricing, and Cost Management Flashcards

Data is accessed rarely but must be returned in milliseconds when requested. Which S3 storage class is most cost-effective?

Answer: S3 Standard-Infrequent Access

S3 Standard-IA costs less to store and still gives millisecond access for rarely used data.

A company has data with unknown or changing access patterns and wants storage costs optimized automatically. Which S3 storage class fits?

Answer: S3 Intelligent-Tiering

S3 Intelligent-Tiering moves objects between access tiers automatically based on usage.

Which S3 storage class is the cheapest for long-term archives that can wait up to 12 hours for retrieval?

Answer: S3 Glacier Deep Archive

Glacier Deep Archive has the lowest storage cost and retrieval within 12 hours.

Which data transfer is usually free?

Answer: Between EC2 instances in the same Availability Zone using private IP addresses

Traffic between instances in the same AZ over private IPs is free, while cross-AZ traffic is charged.

How are On-Demand Linux EC2 instances billed?

Answer: Per second, with a 60-second minimum

Linux On-Demand instances are billed per second with a one-minute minimum.

An EC2 instance is stopped but not terminated. Which charge continues?

Answer: Storage for attached EBS volumes

Compute charges stop when an instance stops, but attached EBS volumes are still billed for storage.

What does a customer commit to when buying a Savings Plan?

Answer: A steady amount of usage in dollars per hour for 1 or 3 years

Savings Plans are a commitment to a steady hourly spend ($/hour) over a 1- or 3-year term.