The answer is an unconfirmed SNS subscription. When a CloudWatch alarm enters the ALARM state and publishes to an SNS topic, the topic will only deliver the notification if every subscriber endpoint—such as an email address, HTTP URL, or SMS number—has confirmed the subscription. Until the subscriber clicks the confirmation link or responds to the initial request, the subscription remains in a "Pending confirmation" state, and SNS silently drops all messages to that endpoint. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this scenario tests your understanding of the SNS subscription lifecycle, which is a common trap: candidates often assume the alarm or topic configuration is faulty when the real issue is a missing confirmation. A useful memory tip is to think of SNS subscriptions like a handshake—until the other party shakes back, no message gets through.
SOA-C02 Monitoring, Logging, and Remediation Practice Question
This SOA-C02 practice question tests your understanding of monitoring, logging, and remediation. 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 admin is investigating why a CloudWatch alarm did not trigger an SNS notification when a metric breached the threshold. The alarm state is visible in the console as 'ALARM'. What is the most likely reason the notification was not sent?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The SNS topic's subscription is not confirmed
The most likely reason the notification was not sent is that the SNS topic's subscription is not confirmed. When an SNS topic sends a notification to an endpoint such as email, HTTP, or SMS, the subscription must first be confirmed by the subscriber. If the subscription remains in a 'Pending confirmation' state, SNS will not deliver messages to that endpoint, even if the CloudWatch alarm transitions to the ALARM state and publishes to the topic.
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.
✓
The SNS topic's subscription is not confirmed
Why this is correct
Email subscriptions require confirmation; if not confirmed, notifications are not delivered.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The alarm name contains special characters
Why it's wrong here
Alarm names can contain special characters; they don't prevent notifications.
✗
The alarm's evaluation period is set to 1 minute
Why it's wrong here
Short evaluation periods work fine; they don't prevent notifications.
✗
The metric has a resolution of 1 minute
Why it's wrong here
Resolution does not impact notification delivery.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume any alarm in ALARM state will automatically trigger its configured SNS action, overlooking the requirement that the SNS subscription must be in a confirmed state before messages can be delivered.
Detailed technical explanation
How to think about this question
Under the hood, SNS uses a subscription confirmation protocol defined in the Amazon SNS API: when a subscription is created, SNS sends a confirmation message (e.g., via email with a link or HTTP POST with a SubscribeURL) to the endpoint. Until the subscriber responds with a confirmation token, the subscription status remains 'Pending confirmation', and SNS will not deliver any published messages to that endpoint. This is a critical step often overlooked in automated setups, especially when using email endpoints where the confirmation email may be missed or filtered as spam.
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.
TExam Day Tips
→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 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. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. 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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Monitoring, Logging, and Remediation — This question tests Monitoring, Logging, and Remediation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The SNS topic's subscription is not confirmed — The most likely reason the notification was not sent is that the SNS topic's subscription is not confirmed. When an SNS topic sends a notification to an endpoint such as email, HTTP, or SMS, the subscription must first be confirmed by the subscriber. If the subscription remains in a 'Pending confirmation' state, SNS will not deliver messages to that endpoint, even if the CloudWatch alarm transitions to the ALARM state and publishes to the topic.
What should I do if I get this SOA-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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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