Covered in full in Domain 3 (§3.3) — On-Demand, Savings Plans, Reserved Instances, Spot, Dedicated Hosts, Dedicated Instances and Capacity Reservations. Two points belong here rather than there:
Reserved Instance flexibility. A Reserved Instance commits you to an instance configuration — type and Region — for one or three years. Some attributes can change within that commitment; the commitment is to the configuration rather than to a specific running instance.
Reserved Instances in AWS Organizations. Discounts are shared across the organization. An RI bought in one account can benefit usage in another, because consolidated billing combines usage across accounts before applying discounts. This is a favourite exam scenario: one team buys an RI and another team's bill drops.
The rule that catches people out:
The shape to remember: inbound free, outbound charged, and crossing a boundary costs more the bigger the boundary.
The S3 storage classes are in Domain 3 (§3.6). The pricing dimension is that cheaper storage buys higher retrieval cost and longer minimum durations — S3 Standard has no minimum and no retrieval fee; Glacier Deep Archive is the cheapest to hold and the slowest and most expensive to read.
| Tool | What it is for | Tense |
|---|---|---|
| AWS Pricing Calculator | Estimate what a planned workload will cost, at On-Demand rates | Before you build |
| AWS Cost Explorer | Analyse cost and usage with visuals, filtering and grouping; forecast; custom reports | Now and past, with forecast |
| AWS Budgets | Set custom cost and usage budgets and get alerted when spending crosses your thresholds | Watching, forward-looking |
| AWS Cost and Usage Reports / data exports | The most detailed line-item cost and usage data, exported for your own analysis | Raw detail |
The single distinction the exam turns on: Cost Explorer shows you what happened; Budgets tells you when something you care about is about to happen. A question about being alerted at 80% of a monthly limit is Budgets. A question about which service drove last quarter's increase is Cost Explorer. A question about estimating before anything exists is the Pricing Calculator.
Also worth knowing:
Cost allocation tags — resource tags you activate for billing, letting you view cost broken down by team, project or environment in Cost Explorer and data exports. Cost categories map costs to teams, applications or environments and can define split-charge rules for shared costs.
The exam framing: if a question asks how to see which department spent what, the answer is cost allocation tags.
Every organization has a management account that pays the charges of all the member accounts. AWS states four benefits:
One detail worth holding: member account bills are informational only, and the management account may reallocate the volume, RI and Savings Plans discounts.
And a trap: when a member account leaves an organization it loses access to the Cost Explorer data generated while it was inside. The data is not deleted — the management account keeps it, and the account regains access if it rejoins.
This is the one place in the exam where studying current AWS material will actively mislead you.
What the exam guide names (task statement 4.3): AWS Developer Support, AWS Business Support, AWS Enterprise On-Ramp Support, AWS Enterprise Support.
What AWS currently sells: Basic, AWS Business Support+, AWS Enterprise Support, AWS Unified Operations.
What is being discontinued on 1 January 2027: Developer Support, Business Support and Enterprise On-Ramp. Enterprise On-Ramp customers are being upgraded to Enterprise Support through 2026. Developer, Business and Enterprise On-Ramp remain available in the AWS GovCloud (US) Region.
Study the exam guide's four plans, because those are what the question bank was written against. But do not be thrown if AWS's own comparison page shows a different set — it does, and Developer and Enterprise On-Ramp are no longer listed on it at all.
Every AWS customer has 24x7 access to:
Basic also covers service quota increase requests. What it does not include is technical support for how to build things — that is the line the exam tests.
| Business Support+ | Enterprise Support | Unified Operations | |
|---|---|---|---|
| Business/mission-critical down | < 30 min | < 15 min | < 5 min, from an Incident Management Engineer |
| Production system down | < 1 hour | < 1 hour | < 1 hour |
| Production system impaired | < 4 hours | < 4 hours | < 4 hours |
| System impaired | < 12 hours | < 12 hours | < 12 hours |
| General guidance | < 24 hours | < 24 hours | < 24 hours |
| Technical Account Manager | No | Yes, designated | Yes, plus a Domain Specialist Engineer |
| Trusted Advisor | Full set of checks (500+) | Full set + Trusted Advisor Priority | Full set + Priority |
| AWS Support API | Yes | Yes | Yes |
Business Support+ also includes 24x7 phone, web and chat access to Cloud Support Engineers, third-party software support (EC2 operating systems and popular software components), and unlimited cases opened by any permitted user.
Enterprise Support adds AWS Security Incident Response at no extra cost, strategic business reviews, and AWS Countdown event management.
[UNVERIFIED] Response times for the retired Developer and Enterprise On-Ramp plans could not be confirmed — AWS has removed both from its comparison page. If the exam tests them, the values commonly cited are Developer at 24 hours general guidance and 12 hours for a system impaired, and Enterprise On-Ramp at 30 minutes for a business-critical case with a pool of Technical Account Managers rather than a designated one. Verify before relying on these.
Trusted Advisor is about your configuration; Health Dashboard is about AWS's status as it affects you.
AWS whitepapers, the AWS Knowledge Center, AWS Prescriptive Guidance, AWS re:Post (the community Q&A site), the AWS Security Blog, and the AWS Support Center for raising cases.
AWS Trust and Safety is the team you report abuse of AWS resources to — a question about someone attacking you from an EC2 instance points here, not to Support.
Practise this with AWS Cloud Practitioner questions