The most likely cause is that the ALB listener is not configured to use the new certificate. ACM automatically renews certificates before expiration, but the renewal does not automatically update the listener association on the Application Load Balancer; the listener must be explicitly updated or the certificate redeployed to the target group. This scenario tests your understanding of the separation between ACM’s lifecycle management and ALB’s listener configuration, a common trap on the AWS Certified Advanced Networking Specialty ANS-C01 exam where candidates assume renewal alone propagates to all integrated services. The search intent here is to troubleshoot ACM certificate renewal not updating on ALB, and the key insight is that while ACM handles renewal, the ALB continues serving the old certificate until you manually select the renewed certificate in the listener’s default or SNI settings. Memory tip: “Renewal is ACM’s job, deployment is yours—listen for the update.”
ANS-C01 Network Security, Compliance and Governance Practice Question
This ANS-C01 practice question tests your understanding of network security, compliance and governance. 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 company uses AWS Certificate Manager (ACM) to issue a public SSL/TLS certificate for a domain hosted on Route 53. The certificate is used by an Application Load Balancer. After renewal, the ALB continues to serve the old certificate. What is the most likely cause?
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 ALB listener is not configured to use the new certificate.
Option A is correct because ACM automatically renews certificates but the ALB may not use the new certificate until it is redeployed or the listener is updated. Option B is wrong because the certificate is public and can be used with an ALB. Option C is wrong because ACM uses DNS validation with Route 53 automatically. Option D is wrong because ACM does not need to import the certificate; it issues it.
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 certificate was not imported into ACM correctly.
Why it's wrong here
ACM issues the certificate; no import needed.
✓
The ALB listener is not configured to use the new certificate.
Why this is correct
After ACM renewal, the listener must be updated to use the new certificate.
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 certificate is a private certificate and cannot be used with an ALB.
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 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 ANS-C01 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.
Network Security, Compliance and Governance — This question tests Network Security, Compliance and Governance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The ALB listener is not configured to use the new certificate. — Option A is correct because ACM automatically renews certificates but the ALB may not use the new certificate until it is redeployed or the listener is updated. Option B is wrong because the certificate is public and can be used with an ALB. Option C is wrong because ACM uses DNS validation with Route 53 automatically. Option D is wrong because ACM does not need to import the certificate; it issues it.
What should I do if I get this ANS-C01 question wrong?
Identify which ANS-C01 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.
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Question Discussion
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