Billing Basics — CLF-C02 practice questions

Practice questions for this topic, with explained answers.

Domain: Billing, Pricing, and Support ·100 questions · 30 easy · 40 intermediate · 30 hard · page 3 of 7

Question 31 clf-billing-basics-031

Intermediate · Choose one

A company plans to run an Amazon RDS database continuously for three years and wants to lower its cost. Which statement is correct?

  1. a Amazon RDS offers Reserved DB Instances with 1-year and 3-year terms that are purchased separately from Amazon EC2 Reserved Instances
  2. b Amazon RDS discounts are obtained by purchasing Amazon EC2 Spot Instances for the database tier
  3. c Amazon EC2 Reserved Instances automatically apply to the Amazon RDS DB instances running in the same account
  4. d Amazon RDS is available only on On-Demand pricing, so the only way to reduce cost is to stop the database when it is idle
Show answer & explanation

Answer: A

Why A is correct

Amazon RDS has its own Reserved DB Instance construct with 1-year and 3-year terms and All Upfront, Partial Upfront, and No Upfront payment options, offering savings of up to 69% compared with On-Demand rates. These reservations are purchased through Amazon RDS and apply only to RDS DB instances. For most engines, including MySQL, MariaDB, PostgreSQL, and Aurora, RDS reservations are size-flexible within an instance family.

Why the others are wrong

  • B — Spot pricing is not offered for Amazon RDS. Spot capacity can be reclaimed at short notice, which is incompatible with a managed relational database.
  • C — EC2 Reserved Instances apply only to EC2 instance usage. They do not cover managed database services, which have their own commitment mechanisms.
  • D — RDS supports committed-use pricing through Reserved DB Instances, so On-Demand is not the only option available.

Last verified: 2026-09-01

Question 32 clf-billing-basics-032

Intermediate · Select 2 answers

Which TWO actions would reduce a company's AWS data transfer charges? (Choose TWO.)

  1. a Move all data transfer to public IPv4 addresses so it is metered under a single aggregated tier
  2. b Place tightly coupled Amazon EC2 instances that exchange large volumes of traffic in the same Availability Zone and have them communicate over private IPv4 addresses
  3. c Serve content to end users through Amazon CloudFront, since data transfer from AWS origins into CloudFront is not charged
  4. d Copy production data to a second AWS Region so that requests can be served from the closer copy
  5. e Change Amazon EC2 instances from On-Demand pricing to Reserved Instances
Show answer & explanation

Answer: B and C

Why B and C are correct

Both actions attack the two places AWS actually meters transfer. Serving through Amazon CloudFront removes the origin-to-CloudFront charge entirely and moves egress onto CloudFront's own pricing, which is generally lower per GB for high volumes. Keeping chatty instances in one Availability Zone and addressing them by private IPv4 avoids the per-GB cross-Availability Zone charge that applies in both directions. Both must still be weighed against resilience requirements.

Why the others are wrong

  • A — Traffic that leaves through a public IPv4 or Elastic IP address is charged even between resources in the same Region, and public IPv4 addresses carry their own hourly charge. This would increase cost.
  • D — Copying data to a second Region adds inter-Region data transfer charges plus a second copy of the storage. It may improve latency or resilience, but it does not reduce transfer cost.
  • E — Reserved Instances discount compute, not data transfer. Data transfer is billed separately from instance hours under every purchasing option.

Last verified: 2026-09-01

Question 33 clf-billing-basics-033

Intermediate · Choose one

Under the current AWS Free Tier, which statement about always-free offers is correct?

  1. a Always-free offers are available only to accounts on the Free account plan
  2. b More than 30 AWS services include monthly usage that is always free, and these apply on both the Free account plan and the Paid account plan
  3. c Always-free offers apply only to accounts that are members of an AWS Organizations organization
  4. d Always-free offers are available only during the first 12 months after an account is created
Show answer & explanation

Answer: B

Why B is correct

AWS states that more than 30 services include monthly usage limits that are always free, and that these apply on both the Free and Paid account plans. AWS Lambda's 1 million monthly requests and 400,000 GB-seconds are a well-known example. Always-free offers do not expire with the account's age, which distinguishes them from short-term trials and from the sign-up credits that come with a new account.

Why the others are wrong

  • A — Both account plans receive always-free offers. Restricting them to the Free plan would penalize customers who move to pay-as-you-go pricing.
  • C — AWS Organizations membership is unrelated to always-free usage limits. Standalone accounts receive them as well.
  • D — A 12-month window describes the legacy free tier model that AWS restructured. Always-free offers, by definition, do not expire after a fixed period.

Last verified: 2026-09-01

Question 34 clf-billing-basics-034

Hard · Choose one

A developer creates a new AWS account and selects the Free account plan. Which statement describes what happens to that account?

  1. a The account receives 12 months of free usage of all AWS services, after which standard rates begin automatically
  2. b The account is billed at standard rates from the first day, and the credits are refunded at the end of the first year
  3. c The account can use every AWS service without charge indefinitely, provided monthly usage stays within published limits
  4. d The account receives sign-up credits, and after six months or once the credits are exhausted, whichever comes first, the plan expires and the account closes unless it is upgraded to the Paid plan
Show answer & explanation

Answer: D

Why D is correct

Under the restructured AWS Free Tier, the Free account plan provides USD 100 in sign-up credits plus the opportunity to earn up to USD 100 more by completing activities, and it runs for six months or until the credits are exhausted, whichever comes first. When the plan expires the account closes automatically, and AWS retains the content for 90 days during which the customer can upgrade to a Paid plan. The Free plan also restricts access to certain features, including Savings Plans and Reserved Instances.

Why the others are wrong

  • A — The 12-month model describes the legacy free tier that AWS replaced. It also never covered all AWS services, only specific offers within stated limits.
  • B — Credits are applied against usage as it is incurred rather than refunded, and the Free plan does not bill at standard rates while it is active.
  • C — The Free plan gives access to a selected set of services, not every service, and the plan itself expires after six months. Only the always-free offers continue indefinitely, and those apply on the Paid plan.

Last verified: 2026-09-01

Question 35 clf-billing-basics-035

Hard · Choose one

A company stores millions of medical images that are read a few times a year but must be returned in milliseconds when a clinician requests one. Which Amazon S3 storage class fits, and what cost characteristic must the company plan for?

  1. a S3 Glacier Flexible Retrieval, which carries a 90-day minimum storage duration charge and returns objects in one to five minutes with Expedited retrieval
  2. b S3 Standard, which carries no minimum storage duration and no retrieval fee
  3. c S3 Glacier Deep Archive, which carries a 180-day minimum storage duration charge and returns objects within 12 hours
  4. d S3 Glacier Instant Retrieval, which carries a 90-day minimum storage duration charge and a per-GB retrieval fee
Show answer & explanation

Answer: D

Why D is correct

S3 Glacier Instant Retrieval is built for exactly this profile: long-lived archives that are rarely accessed but must come back immediately. It delivers millisecond first-byte latency with no restore step, at a storage rate well below S3 Standard-IA. The costs to plan for are the 90-day minimum storage duration charge and the per-GB retrieval fee, so the class only pays off when objects genuinely stay for months and are read infrequently.

Why the others are wrong

  • A — Glacier Flexible Retrieval requires an explicit restore and returns data in minutes to hours. Even Expedited retrieval at one to five minutes fails a millisecond requirement.
  • B — S3 Standard would meet the latency requirement, but at roughly six times the per-GB storage rate of Glacier Instant Retrieval it is the wrong economics for data read a few times a year.
  • C — Deep Archive returns objects in 12 to 48 hours, which cannot satisfy a clinician waiting on an image.

Last verified: 2026-09-01

Question 36 clf-billing-basics-036

Hard · Select 2 answers

Which TWO statements about Amazon S3 pricing dimensions are correct? (Choose TWO.)

  1. a Storage is the only Amazon S3 charge; requests and retrievals are included in the per-GB rate
  2. b Data transferred into Amazon S3 from the internet is charged at the same rate as data transferred out
  3. c Objects stored in S3 Standard are subject to a 30-day minimum storage duration charge
  4. d S3 Intelligent-Tiering charges a monthly monitoring and automation fee per object but charges no retrieval fees
  5. e Customers are billed for requests such as PUT, COPY, POST, LIST, and GET in addition to the storage they consume
Show answer & explanation

Answer: D and E

Why D and E are correct

Amazon S3 bills across several independent dimensions, and a candidate who thinks only about per-GB storage will misestimate badly. Requests are a genuine line item, which is why workloads with very large numbers of small objects can be request-dominated. S3 Intelligent-Tiering adds a per-object monitoring and automation charge in exchange for automatic tiering, and it deliberately charges no retrieval fees, which is what makes it safe for unpredictable access patterns.

Why the others are wrong

  • A — Storage is only one dimension. Requests and retrievals, data transfer, management features such as S3 Storage Lens and inventory, and replication are all billed separately.
  • B — Data transfer into Amazon S3 from the internet is free. Only outbound transfer is charged, and it is tiered.
  • C — S3 Standard has no minimum storage duration charge. Minimum durations apply to S3 Standard-IA and One Zone-IA at 30 days, the Glacier Instant Retrieval and Glacier Flexible Retrieval classes at 90 days, and Deep Archive at 180 days.

Last verified: 2026-09-01

Question 37 clf-billing-basics-037

Hard · Choose one

A company converts a single-AZ Amazon RDS deployment to a Multi-AZ deployment. Which cost effect should it expect?

  1. a The hourly DB instance charge is unchanged, and only a small fee is added for automatic failover
  2. b Costs decrease, because read traffic is distributed between the primary and the standby
  3. c The hourly DB instance charge increases because a standby is provisioned, and write I/O roughly doubles, but replication traffic between the primary and the standby is not charged
  4. d The hourly DB instance charge increases, and data transfer between the primary and the standby is charged at the standard cross-Availability Zone rate
Show answer & explanation

Answer: C

Why C is correct

A Multi-AZ deployment provisions a standby DB instance in a second Availability Zone, so the hourly instance charge reflects two instances rather than one. Because RDS replicates writes synchronously to the standby, write I/O roughly doubles while read I/O is unchanged. AWS does not charge for the replication traffic between the primary and the standby. Multi-AZ is bought for availability and durability, not for performance, and the pricing reflects that.

Why the others are wrong

  • A — There is no small failover fee. The cost of Multi-AZ is the standby instance itself plus the additional write I/O.
  • B — In a Multi-AZ DB instance deployment the standby does not serve read traffic; it exists to take over on failover. Read scaling comes from read replicas, or from a Multi-AZ DB cluster deployment, which does have readable standbys.
  • D — AWS explicitly exempts Multi-AZ replication traffic between the primary and the standby from data transfer charges.

Last verified: 2026-09-01

Question 38 clf-billing-basics-038

Hard · Select 2 answers

Which TWO statements about Amazon S3 minimum storage duration charges are correct? (Choose TWO.)

  1. a S3 Glacier Flexible Retrieval applies a 30-day minimum storage duration charge
  2. b S3 Glacier Deep Archive applies a 180-day minimum storage duration charge
  3. c S3 Intelligent-Tiering applies a 90-day minimum storage duration charge to every object it stores
  4. d An object deleted from S3 Standard-Infrequent Access after 10 days is still billed for 30 days of storage
  5. e S3 One Zone-Infrequent Access applies no minimum storage duration charge because it uses a single Availability Zone
Show answer & explanation

Answer: B and D

Why B and D are correct

Minimum storage duration charges are a defining cost characteristic of the infrequent-access and archive classes, and they exist to stop short-lived data from being parked in classes priced for long retention. S3 Standard-IA and S3 One Zone-IA both apply 30 days, S3 Glacier Instant Retrieval and S3 Glacier Flexible Retrieval both apply 90 days, and S3 Glacier Deep Archive applies 180 days. An object removed before the minimum is still billed for the full period, which is why lifecycle policies that transition data too aggressively often raise the bill.

Why the others are wrong

  • A — S3 Glacier Flexible Retrieval applies a 90-day minimum storage duration charge, not 30 days. The 30-day minimum belongs to the two infrequent-access classes.
  • C — S3 Intelligent-Tiering has no minimum storage duration charge. Its distinguishing charge is a per-object monthly monitoring and automation fee, and it levies no retrieval fees.
  • E — S3 One Zone-IA does apply a 30-day minimum storage duration charge. Its single-Availability-Zone design lowers the per-GB rate but does not remove the minimum duration.

Last verified: 2026-09-01

Question 39 clf-billing-basics-039

Easy · Choose one

Which AWS service lets a company visualize and analyze its AWS costs and usage over time using graphs and reports?

  1. a AWS Trusted Advisor
  2. b AWS Pricing Calculator
  3. c AWS Config
  4. d AWS Cost Explorer
Show answer & explanation

Answer: D

Why D is correct

AWS Cost Explorer is the visualization and analysis tool for costs and usage that have already been incurred. It presents spend as graphs and tabular reports that can be filtered and grouped by dimensions such as service, linked account, Region, and tag, and it also surfaces Reserved Instance and rightsizing recommendations. The console experience is available at no charge.

Why the others are wrong

  • A — AWS Trusted Advisor inspects an environment against best practices and produces recommendations, including cost optimization findings, but it is not a tool for visualizing spend over time.
  • B — AWS Pricing Calculator estimates the cost of workloads a customer has not yet deployed. It works from configuration parameters the customer enters, not from actual usage.
  • C — AWS Config records and evaluates resource configuration changes for compliance and auditing. It does not report on cost or usage.

Last verified: 2026-09-01

Question 40 clf-billing-basics-040

Easy · Choose one

A company wants to be notified by email when its monthly AWS spending is forecast to exceed a set dollar amount. Which service should it use?

  1. a AWS Budgets
  2. b AWS CloudTrail
  3. c AWS Cost and Usage Reports
  4. d AWS Pricing Calculator
Show answer & explanation

Answer: A

Why A is correct

AWS Budgets is the service for setting cost and usage thresholds and being alerted when actual or forecast spend crosses them. Notifications can be delivered by email, through an Amazon SNS topic, or into a chat application. Budgets can also trigger Budget Actions, which apply a control such as a restrictive IAM policy automatically when a threshold is breached, so the response can go beyond notification.

Why the others are wrong

  • B — AWS CloudTrail records API activity for governance and auditing. It captures who did what, not how much it cost.
  • C — AWS Cost and Usage Reports deliver highly detailed billing data to an Amazon S3 bucket for analysis. They are a data source, not an alerting mechanism.
  • D — AWS Pricing Calculator produces estimates for planned workloads before deployment and has no visibility into actual account spending.

Last verified: 2026-09-01

Question 41 clf-billing-basics-041

Easy · Choose one

A company is designing a new architecture and wants to estimate its monthly AWS cost before deploying anything. Which tool should it use?

  1. a AWS Cost and Usage Reports
  2. b AWS Budgets
  3. c AWS Pricing Calculator
  4. d AWS Cost Explorer
Show answer & explanation

Answer: C

Why C is correct

AWS Pricing Calculator is a free web-based planning tool for modeling the cost of a solution before it exists. The customer enters configuration parameters such as instance type, Region, storage size, and payment option, and the calculator produces upfront, monthly, and annual estimates with the calculation shown. Estimates can be saved, shared by link, and exported to CSV or PDF. The public calculator at calculator.aws requires no AWS account at all, while a separate in-console AWS Pricing Calculator inside AWS Billing and Cost Management can additionally model an existing account's discounts and purchase commitments.

Why the others are wrong

  • A — Cost and Usage Reports are generated from actual metered usage and therefore cannot describe a workload that has not run.
  • B — AWS Budgets tracks actual and forecast spend against thresholds on a live account, so it presumes usage already exists.
  • D — Cost Explorer analyzes costs that have already been incurred. It cannot price an architecture that has never been deployed.

Last verified: 2026-09-01

Question 42 clf-billing-basics-042

Easy · Choose one

Which AWS billing resource provides the most comprehensive and granular set of cost and usage data available?

  1. a AWS Cost and Usage Reports
  2. b AWS Cost Explorer
  3. c The Bills page of the AWS Billing and Cost Management console
  4. d AWS Budgets
Show answer & explanation

Answer: A

Why A is correct

AWS Cost and Usage Reports contain the most comprehensive cost and usage data AWS publishes. Each report holds line items for every unique combination of AWS product, usage type, and operation in the account, can be aggregated hourly, daily, or monthly, and is delivered to an Amazon S3 bucket the customer owns. That level of detail is what makes the report the right input for chargeback, showback, and analysis in a data warehouse or query engine. AWS now also offers Data Exports as the recommended way to receive this data, delivering the same underlying dataset in a customizable schema to an Amazon S3 bucket you own.

Why the others are wrong

  • B — Cost Explorer is an interactive analysis and visualization layer. It is quicker to use but presents aggregated views rather than the full line-item detail of the report.
  • C — The Bills page summarizes charges for a billing period by service and account. It is a summary view, not a granular dataset.
  • D — AWS Budgets tracks spend against thresholds and issues alerts. It is not a source of detailed usage records.

Last verified: 2026-09-01

Question 43 clf-billing-basics-043

Easy · Choose one

Where are AWS Cost and Usage Reports delivered?

  1. a To an Amazon EBS volume attached to a designated Amazon EC2 instance
  2. b To an Amazon S3 bucket that the customer owns
  3. c To an email address configured on the account
  4. d To the AWS Support Center console for download
Show answer & explanation

Answer: B

Why B is correct

AWS publishes Cost and Usage Reports to an Amazon S3 bucket that the customer owns and specifies. Delivering to customer-owned storage is what allows the data to be queried directly with services such as Amazon Athena or loaded into Amazon Redshift, and it means the customer controls retention and access to their own billing detail. AWS updates the report in the bucket at least once a day, and the first delivery can take up to 24 hours.

Why the others are wrong

  • A — There is no delivery mechanism to an EBS volume. The report is written to object storage.
  • C — Email delivery is used for AWS Budgets notifications, not for the report itself, which is far too large and detailed for email.
  • D — The AWS Support Center is for creating and managing support cases. Billing reports are not distributed through it.

Last verified: 2026-09-01

Question 44 clf-billing-basics-044

Intermediate · Choose one

A finance team wants to review 12 months of past AWS spending broken down by service and by linked account, and to see a forecast of future spend. Which tool provides this directly and at no charge in the console?

  1. a AWS Cost Explorer
  2. b AWS Service Catalog
  3. c AWS Compute Optimizer
  4. d AWS Pricing Calculator
Show answer & explanation

Answer: A

Why A is correct

Cost Explorer displays up to 13 months of historical cost and usage data alongside a forecast of future spend, and it can group and filter by dimensions including service, linked account, Region, usage type, and cost allocation tag. Using the Cost Explorer user interface is free of charge; only programmatic access through the Cost Explorer API is billed, at a small per-request rate. Data for the current month becomes available in about 24 hours and refreshes at least daily.

Why the others are wrong

  • B — AWS Service Catalog lets organizations curate and govern approved products for deployment. It has no cost reporting function.
  • C — AWS Compute Optimizer analyzes Amazon CloudWatch utilization metrics to recommend rightsizing. It reports on resource efficiency rather than on spend by service and account.
  • D — AWS Pricing Calculator models the cost of hypothetical configurations. It holds no historical data about the account.

Last verified: 2026-09-01

Question 45 clf-billing-basics-045

Intermediate · Choose one

A company has purchased Savings Plans and wants to be alerted when the percentage of its eligible usage covered by those plans falls below a target. Which AWS Budgets budget type should it create?

  1. a A Savings Plans utilization budget
  2. b A usage budget
  3. c A Savings Plans coverage budget
  4. d A cost budget
Show answer & explanation

Answer: C

Why C is correct

Coverage and utilization answer opposite questions, and AWS Budgets provides a budget type for each. A coverage budget tracks what proportion of eligible usage is being covered by the commitment, so it alerts when the company is running more On-Demand usage than it intended and should consider buying more commitment. That is exactly the question asked here.

Why the others are wrong

  • A — A utilization budget tracks how much of the commitment the company has purchased is actually being used. It alerts on wasted commitment, which is the opposite concern.
  • B — A usage budget tracks the quantity of a service consumed, such as instance hours or GB stored, not commitment coverage.
  • D — A cost budget tracks dollars spent against a threshold. It cannot express a coverage percentage for a commitment.

Last verified: 2026-09-01