Quick Answer
The answer is AWS Budgets, as it is the only service designed to proactively send email alerts when actual or forecasted costs exceed defined thresholds. AWS Budgets allows you to set custom cost and usage limits, then triggers notifications via Amazon SNS when those limits are breached, making it the correct tool for cost alerting. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this question tests your ability to distinguish between cost analysis tools like Cost Explorer and cost alerting tools like Budgets—a common trap is confusing Cost Explorer’s visualization capabilities with Budgets’ alerting function. Remember, Cost Explorer is for looking backward at spending, while Budgets is for looking forward and catching overruns. A simple memory tip: Budgets = Boundaries and alerts; Cost Explorer = Exploration and reports.
This SOA-C02 practice question tests your understanding of cost and performance optimization. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company is using AWS Cost Explorer to analyze spending. They want to receive an email alert when costs exceed a certain threshold. Which service should they use?
AWS Trusted Advisor
Why wrong: Trusted Advisor provides cost optimization recommendations, not alerts.
AWS Cost Explorer
Why wrong: Cost Explorer is for visualizing costs, not sending alerts.
Amazon CloudWatch
Why wrong: CloudWatch can monitor metrics but not AWS costs directly.
AWS Budgets
AWS Budgets can send notifications when costs exceed thresholds.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
AWS Budgets
Option D is correct because AWS Budgets can send alerts when costs exceed thresholds. Option A is wrong because Cost Explorer is for analysis, not alerts. Option B is wrong because CloudWatch does not natively monitor AWS costs. Option C is wrong because Trusted Advisor provides recommendations, not cost alerts.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
AWS Trusted Advisor
Why it's wrong here
Trusted Advisor provides cost optimization recommendations, not alerts.
AWS Cost Explorer
Why it's wrong here
Cost Explorer is for visualizing costs, not sending alerts.
Amazon CloudWatch
Why it's wrong here
CloudWatch can monitor metrics but not AWS costs directly.
AWS Budgets
Why this is correct
AWS Budgets can send notifications when costs exceed thresholds.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
A startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
What to study next
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SOA-C02 NAT questions on configuration and troubleshooting.
Cost and Performance Optimization — study guide chapter
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Cost and Performance Optimization practice questions
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FAQ
Cost and Performance Optimization — This question tests Cost and Performance Optimization — Static NAT maps one inside address to one outside address..
The correct answer is: AWS Budgets — Option D is correct because AWS Budgets can send alerts when costs exceed thresholds. Option A is wrong because Cost Explorer is for analysis, not alerts. Option B is wrong because CloudWatch does not natively monitor AWS costs. Option C is wrong because Trusted Advisor provides recommendations, not cost alerts.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SOA-C02 NAT questions on configuration and troubleshooting.
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 20, 2026
This SOA-C02 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SOA-C02 exam.
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