The answer is an unconfirmed SNS subscription for the engineer's contact. This is the most likely cause of the Systems Manager Incident Manager notification not received because SNS topics require each endpoint—such as an email or SMS number—to confirm the subscription before any messages are delivered; until that confirmation link is clicked, the subscription remains in a "Pending confirmation" state and silently drops all notifications. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this question tests your understanding of the prerequisite subscription workflow for SNS, a common oversight when configuring Incident Manager escalation plans. A frequent trap is assuming that simply adding a contact to Systems Manager Incident Manager automatically enables delivery, but the actual notification path depends on the SNS topic’s subscription status. Memory tip: think of SNS subscriptions like a handshake—no confirmation, no delivery.
DOP-C02 Incident and Event Response Practice Question
This DOP-C02 practice question tests your understanding of incident and event response. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 DevOps team uses AWS Systems Manager Incident Manager for incident response. They have an escalation plan that sends notifications to an SNS topic. However, during a recent incident, the on-call engineer did not receive the notification. The engineer's phone number and email are correct in the SSM Incident Manager contact settings. What is the MOST likely cause of the missed notification?
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 subscription for the engineer's contact was never confirmed.
Option D is correct because SNS topic subscriptions must be confirmed (typically via email) before delivery begins; an unconfirmed subscription will not deliver messages. Option A is wrong because CloudWatch alarm actions use different IAM permissions; the issue is subscription-level. Option B is wrong because SNS delivery is regional; cross-region delivery works fine. Option C is wrong because SSM Incident Manager does not require a VPC endpoint to send SNS notifications.
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.
✗
SSM Incident Manager requires a VPC endpoint for SNS, which is not configured.
Why it's wrong here
SSM Incident Manager uses public endpoints by default; VPC endpoints are optional.
✗
The SNS topic's IAM policy does not allow Systems Manager to publish messages.
Why it's wrong here
The policy allows publishing; the issue is at the subscriber end.
✓
The SNS subscription for the engineer's contact was never confirmed.
Why this is correct
SNS requires subscription confirmation for email/HTTP endpoints; without confirmation, notifications are not sent.
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 SNS topic and the engineer's contact are in different AWS Regions.
Why it's wrong here
SNS can deliver globally; region mismatch does not prevent delivery.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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.
Incident and Event Response — This question tests Incident and Event Response — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The SNS subscription for the engineer's contact was never confirmed. — Option D is correct because SNS topic subscriptions must be confirmed (typically via email) before delivery begins; an unconfirmed subscription will not deliver messages. Option A is wrong because CloudWatch alarm actions use different IAM permissions; the issue is subscription-level. Option B is wrong because SNS delivery is regional; cross-region delivery works fine. Option C is wrong because SSM Incident Manager does not require a VPC endpoint to send SNS notifications.
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.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
This DOP-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 DOP-C02 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.