The answer is CloudWatch Metrics, CloudWatch Alarm, and Amazon SNS. This combination works because CloudWatch Metrics collects the raw CPU utilization data from the EC2 instance, the CloudWatch Alarm evaluates that metric against the threshold of average CPU exceeding 80% for five consecutive minutes, and Amazon SNS handles the notification delivery when the alarm state is triggered. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this scenario tests your understanding of the core monitoring triad—metrics, alarms, and notifications—and often appears as a distractor where CloudWatch Logs is incorrectly selected for metric-based alerts. A common trap is assuming Lambda is required for simple notifications, but SNS alone is sufficient for direct alarm actions. Remember the mnemonic “M-A-S” (Metrics, Alarm, SNS) to quickly recall the correct services for any threshold-based notification setup.
SOA-C02 Cost and Performance Optimization Practice Question
This SOA-C02 practice question tests your understanding of cost and performance optimization. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 SysOps team is using CloudWatch to monitor CPU utilization of EC2 instances. They want to receive a notification when average CPU exceeds 80% for 5 consecutive minutes. Which combination of services should they use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
CloudWatch Metrics, CloudWatch Alarm, and Amazon SNS
Option A is correct because CloudWatch Metrics collect CPU data, CloudWatch Alarm triggers when threshold is breached, and SNS sends notifications. CloudWatch Logs is for log data, not metrics. Lambda is not needed for simple notification. Systems Manager is for management, not monitoring.
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
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
CloudWatch Metrics, CloudWatch Alarm, and AWS Lambda
Why it's wrong here
Lambda not needed; SNS is simpler and cheaper.
✗
AWS Config, CloudWatch Alarm, and Amazon SNS
Why it's wrong here
AWS Config monitors configuration changes, not CPU metrics.
✓
CloudWatch Metrics, CloudWatch Alarm, and Amazon SNS
Static NAT maps one inside address to one outside address.
✗
CloudWatch Logs, CloudWatch Alarm, and AWS Lambda
Why it's wrong here
CloudWatch Logs is for log data, not CPU metrics.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
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
How to think about this question
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.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
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
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
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 — This question tests Cost and Performance Optimization — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: CloudWatch Metrics, CloudWatch Alarm, and Amazon SNS — Option A is correct because CloudWatch Metrics collect CPU data, CloudWatch Alarm triggers when threshold is breached, and SNS sends notifications. CloudWatch Logs is for log data, not metrics. Lambda is not needed for simple notification. Systems Manager is for management, not monitoring.
What should I do if I get this SOA-C02 question wrong?
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.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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