Mixed practice exam 6

Explanation

Answer: A. AWS makes the Cost Explorer console experience free so that every customer can see and understand their spend without a cost barrier. Programmatic access is where charges begin: each paginated Cost Explorer API request costs USD 0.01. That distinction matters when a team plans to pull cost data into a dashboard or reporting pipeline on a schedule, because request volume becomes a real line item.

• B. AWS does not price any cost management tool as a percentage of spend. Support plans use tiered percentage pricing, but Cost Explorer does not.
• C. The user interface is explicitly free. Only API requests are charged.
• D. Cost Explorer is a billing and cost management capability available regardless of AWS Support plan. Support plans govern support cases, Trusted Advisor check coverage, and similar entitlements.

Explanation

Answer: D. AWS Budgets actions turn a budget from a passive alert into an automated control. When a threshold is breached, Budgets can apply a custom IAM policy that denies the ability to provision further resources, attach a service control policy, or stop running Amazon EC2 or Amazon RDS instances. The action can be configured to run automatically or to require approval, which lets a finance team enforce a hard stop rather than merely notifying someone.

• A. Rightsizing recommendations suggest smaller instance types based on utilization. They are advisory and are not triggered by a spending threshold.
• B. Cost and Usage Report delivery simply writes files to Amazon S3. It performs no evaluation and takes no action.
• C. A service control policy defines the maximum permissions available to accounts in an organization, but it is a static guardrail. It does not evaluate spending or activate itself when a budget threshold is crossed, although Budgets actions can attach one.

Explanation

Answer: D. AWS Budgets information is updated up to three times a day, with updates typically occurring 8 to 12 hours after the previous one. This matters operationally: Budgets is a governance and awareness tool, not a real-time circuit breaker, so an account can overspend a threshold for several hours before an alert fires. Teams that need tighter control pair Budgets alerts with Budgets actions and with preventive guardrails such as service control policies.

• A. Monthly evaluation would make budget alerts useless for preventing overspend within a billing period. Budgets updates multiple times a day.
• B. AWS does not evaluate budgets in real time. Expecting second-level alerting leads teams to over-trust Budgets as a spending control.
• C. Budget evaluation is automatic on AWS's refresh schedule and does not depend on a manual request.

Explanation

Answer: A and C. The public AWS Pricing Calculator is a forward-looking planning tool. It builds an estimate purely from the configuration the user describes, which is what allows someone with no AWS account and no cloud experience to price a design. The resulting estimate can be saved, shared by link, and exported to CSV or PDF, which is why it is commonly used to support internal business cases and procurement conversations.

• B. The public calculator prices against public list rates and has no visibility into an individual account's commitments or credits. AWS does offer a separate in-console AWS Pricing Calculator within AWS Billing and Cost Management that can model discounts and purchase commitments, but that is an account-scoped feature and requires an AWS account.
• D. The two tools address different questions. Cost Explorer analyzes spend that has already happened; the calculator estimates spend that has not happened yet.
• E. No AWS account is required for the public calculator, and AWS specifically notes that the tool is useful for people who have never used AWS. Only the separate in-console version requires an account.

Explanation

Answer: B. AWS Compute Optimizer analyzes resource configuration and Amazon CloudWatch utilization metrics, by default over the previous 14 days, and returns rightsizing recommendations and identifies idle resources. It covers Amazon EC2 instances, EC2 Auto Scaling groups, Amazon EBS volumes, AWS Lambda functions, Amazon ECS services on AWS Fargate, and several database services. Because the recommendations are grounded in measured utilization, they are more specific than generic best-practice advice.

• A. AWS Systems Manager provides operational management for resources at scale, including patching, automation, and inventory. Rightsizing analysis is not its purpose.
• C. The AWS Well-Architected Tool guides a structured architecture review against the framework's pillars. It produces improvement plans rather than metric-driven rightsizing recommendations for specific instances.
• D. AWS Pricing Calculator prices a configuration the user describes. It has no access to utilization metrics from running resources.

Explanation

Answer: C. Cost and Usage Reports are the right tool whenever the requirement is analytical rather than exploratory. The report can be aggregated hourly, includes activated cost allocation tags as columns, and lands in a customer-owned Amazon S3 bucket in a format suited to query engines and data warehouses. That combination of granularity, tag enrichment, and customer-controlled storage is what makes team-level chargeback possible.

• A. AWS Budgets publishes threshold notifications, not billing records. It cannot serve as a data feed.
• B. The calculator estimates prices for hypothetical configurations. It cannot reproduce what an account actually consumed.
• D. Manual CSV exports lose the line-item granularity that chargeback requires, and a manual monthly process across two years of data is neither repeatable nor auditable.

Explanation

Answer: C. Utilization measures the commitment side of the equation: of the reservation hours the company bought, how many were actually matched to running instances. Falling utilization means paid-for commitment is being wasted, which is precisely the alert requested. Keeping utilization and coverage straight is the key discrimination here, because both are expressed as percentages and both relate to commitments.

• A. Unused reservations do not increase EC2 cost; the reservation is already paid for. A cost budget would show no signal at all.
• B. Unused reservations mean fewer instances are running than expected, but a usage budget on instance hours cannot distinguish a planned reduction from wasted commitment.
• D. Coverage measures the usage side: how much running usage is being covered by commitments. It alerts on under-buying, not on waste.

Explanation

Answer: C and E. The two tools sit at opposite ends of the same pipeline. Cost Explorer is for people who want to look at spend now, interactively, with grouping, filtering, and forecasting in the console. Cost and Usage Reports are for systems: the most granular data AWS produces, aggregated hourly, daily, or monthly, and written as files to an Amazon S3 bucket the customer owns so it can be queried or loaded elsewhere. Choosing between them is a question of whether a human or a query engine is the consumer.

• A. Full line-item detail for every product, usage type, and operation combination is the defining characteristic of the Cost and Usage Report, not of Cost Explorer.
• B. Forecasting graphs are a Cost Explorer feature. The Cost and Usage Report is a set of data files with no console visualization of its own.
• D. Cost Explorer is viewed directly in the AWS Billing and Cost Management console and requires no S3 bucket. Delivery to S3 is how the Cost and Usage Report works.

Explanation

Answer: C. Cost investigation runs from broad to narrow and then forward. Cost Explorer answers where the increase came from by service, account, Region, and tag; the Cost and Usage Report supplies the individual line items once the area is known; and AWS Budgets with alerts and actions converts the lesson into a control that fires before the next invoice. Understanding this progression matters more than memorizing any single tool, because each tool solves only one stage.

• A. CloudTrail records API activity rather than spend, and while AWS Config can flag noncompliant configurations, neither tool reports cost.
• B. The calculator prices hypothetical configurations and cannot explain actual charges, and a support case does not identify the cause. AWS does not credit legitimate usage.
• D. Service limits checks report how close usage is to a quota. Raising a quota permits more usage and therefore more cost, so this reverses the intended outcome.

Explanation

Answer: D. AWS Organizations groups multiple AWS accounts under a single management account, which pays the charges for all member accounts. Beyond one consolidated bill, the organization pools usage so that volume pricing tiers, Reserved Instance discounts, and Savings Plans apply across all accounts. Organizations also provides organizational units and service control policies for governance, so the same construct serves both the finance and the security teams.

• A. AWS Systems Manager provides operational management of resources, such as patching and automation. It has no billing function.
• B. AWS IAM Identity Center centrally manages workforce identity and access to multiple accounts and applications. It handles who can sign in, not who pays the bill.
• C. AWS Resource Access Manager shares specific resources, such as subnets or transit gateways, across accounts. It does not consolidate billing.