The correct answer is to verify that the CloudWatch alarm is using the metric HTTPCode_Target_5XX_Count and that the threshold is appropriate. This is because the ALB exposes two distinct 5xx metrics: HTTPCode_ELB_5XX_Count, which counts errors generated by the load balancer itself (like a 503 due to no healthy targets), and HTTPCode_Target_5XX_Count, which counts 5xx responses actually returned by the backend targets. If the alarm was mistakenly set on the ELB-level metric, it would never fire when the application itself returns errors, as the ALB simply forwards those responses. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this scenario tests your understanding of ALB metric granularity and the common trap of confusing load balancer errors with target errors. A reliable memory tip is: “Targets throw the 5xx, ELB throws the 503.”
DOP-C02 Monitoring and Logging Practice Question
This DOP-C02 practice question tests your understanding of monitoring and logging. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 AWS CloudFormation to deploy a three-tier web application. The stack includes an Application Load Balancer (ALB), an Auto Scaling group of EC2 instances, and an Amazon RDS Multi-AZ database. The DevOps team has configured the EC2 instances to send application logs to CloudWatch Logs using the CloudWatch agent. They also set up a CloudWatch alarm on the ALB's 5xx error count. During a recent deployment, the team noticed that the alarm did not trigger even though the application was returning 5xx errors. The team verified that the CloudWatch agent is running on the instances and logs are appearing in CloudWatch Logs. What should the team do to ensure the alarm triggers correctly?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Verify that the CloudWatch alarm is using the correct metric 'HTTPCode_Target_5XX_Count' and that the threshold is appropriate.
Option D is correct. The ALB's 5xx metric is based on requests that the ALB itself generates, not the backend responses. If the backend returns a 5xx, the ALB forwards it, but the metric may be 'HTTPCode_Target_5XX_Count'. The team may have confused the metrics. Option A is incorrect because the agent is already working. Option B is incorrect because the alarm is on ALB, not EC2. Option C is incorrect because log groups do not affect alarms.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Create a metric filter on the EC2 instance's log group to count 5xx errors and create an alarm on that.
Why it's wrong here
The team wants to monitor ALB errors, not instance logs.
✗
Change the CloudWatch alarm to use the 'HTTPCode_ELB_5XX_Count' metric instead.
Why it's wrong here
That metric counts ELB-generated 5xx, not target errors.
✗
Restart the CloudWatch agent on the EC2 instances.
Why it's wrong here
The agent is already sending logs.
✓
Verify that the CloudWatch alarm is using the correct metric 'HTTPCode_Target_5XX_Count' and that the threshold is appropriate.
Why this is correct
The correct metric for backend errors is HTTPCode_Target_5XX_Count.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
Identify which DOP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Monitoring and Logging — This question tests Monitoring and Logging — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Verify that the CloudWatch alarm is using the correct metric 'HTTPCode_Target_5XX_Count' and that the threshold is appropriate. — Option D is correct. The ALB's 5xx metric is based on requests that the ALB itself generates, not the backend responses. If the backend returns a 5xx, the ALB forwards it, but the metric may be 'HTTPCode_Target_5XX_Count'. The team may have confused the metrics. Option A is incorrect because the agent is already working. Option B is incorrect because the alarm is on ALB, not EC2. Option C is incorrect because log groups do not affect alarms.
What should I do if I get this DOP-C02 question wrong?
Identify which DOP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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