The answer is to create a CloudWatch alarm on the CPUUtilization metric with a threshold of 80% for 5 consecutive periods. This is the most efficient approach because CloudWatch alarms are designed to monitor a single metric over a specified number of evaluation periods—here, five 1-minute periods—and trigger an action when the threshold is breached, directly matching the requirement without any additional services. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this question tests your ability to distinguish between native monitoring tools: CloudWatch alarms handle metric-based thresholds, while CloudWatch Logs processes log data, CloudTrail audits API calls, and EventBridge requires a more complex setup for event-driven rules. A common trap is overcomplicating the solution with EventBridge, but the alarm’s built-in consecutive period logic is the simplest and most efficient path. Memory tip: “Alarm for metrics, Logs for text, Trail for clicks, Bridge for events—keep it native for the quick fix.”
SOA-C02 Cost and Performance Optimization Practice Question
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 uses Amazon CloudWatch to monitor its AWS resources. The company wants to receive alerts when CPU utilization of an EC2 instance exceeds 80% for 5 consecutive minutes. What is the MOST efficient way to achieve this?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a CloudWatch alarm on the CPUUtilization metric with a threshold of 80% for 5 consecutive periods.
A CloudWatch alarm can be set to trigger when the CPUUtilization metric exceeds 80% for 5 consecutive minutes (e.g., 5 evaluation periods of 1 minute each). This is the native and efficient way. CloudWatch Logs is for log data. CloudTrail is for API activity. EventBridge is for event-driven actions but requires a more complex setup.
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.
✗
Use CloudWatch Logs to parse CPU utilization from system logs and trigger an alert.
Why it's wrong here
CloudWatch Logs is not designed for metric-based alerts.
✗
Use Amazon EventBridge to schedule a Lambda function that checks CPU utilization.
Why it's wrong here
This is more complex and less efficient than a CloudWatch alarm.
✗
Use AWS CloudTrail to monitor EC2 instance metrics.
Why it's wrong here
CloudTrail records API calls, not metrics.
✓
Create a CloudWatch alarm on the CPUUtilization metric with a threshold of 80% for 5 consecutive periods.
Why this is correct
This is the direct and efficient method.
Related concept
Static NAT maps one inside address to one outside address.
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: Create a CloudWatch alarm on the CPUUtilization metric with a threshold of 80% for 5 consecutive periods. — A CloudWatch alarm can be set to trigger when the CPUUtilization metric exceeds 80% for 5 consecutive minutes (e.g., 5 evaluation periods of 1 minute each). This is the native and efficient way. CloudWatch Logs is for log data. CloudTrail is for API activity. EventBridge is for event-driven actions but requires a more complex setup.
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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