- A
Update the security group of the new instances to allow outbound traffic to the database security group.
The new instances likely have different security groups that are not permitted to access the database.
- B
Modify the CodeDeploy deployment group to include the database security group.
Why wrong: Deployment groups do not manage security groups of external resources.
- C
Configure the database to use a DNS name that resolves to the new instances after the deployment.
If the application connects using a DNS name that points to the old instances, updating it to point to the new instances ensures connectivity.
- D
Increase the number of instances in the Auto Scaling group.
Why wrong: More instances do not solve connectivity issues.
- E
Reinstall the CodeDeploy agent on the new instances.
Why wrong: The agent is not related to database connectivity.
Quick Answer
The answer is to configure the database to use a DNS name that resolves to the new instances after the deployment and to ensure the new instances have proper security group rules to access the database. This resolves CodeDeploy Blue/Green database connectivity issues because when traffic shifts to the new Auto Scaling group, those instances lack network authorization and the database may still point to the old instances’ IPs. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this scenario tests your understanding of how Blue/Green deployments decouple compute from stateful resources, and a common trap is assuming the issue is with instance count or the CodeDeploy agent. Remember: Blue/Green breaks connectivity if security groups and DNS resolution aren’t updated to match the new environment. A useful memory tip is “DNS and SG — the two keys to Blue/Green connectivity.”
DOP-C02 SDLC Automation Practice Question
This DOP-C02 practice question tests your understanding of sdlc automation. 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.
An organization uses AWS CodeDeploy to deploy a web application to an Auto Scaling group. The deployment strategy is 'Blue/Green'. After a successful deployment, traffic is routed to the new instances. However, the application experiences errors because the new instances cannot connect to the database. Which TWO configuration changes could resolve this issue?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Update the security group of the new instances to allow outbound traffic to the database security group.
Option B is correct because the new instances need proper security group rules to access the database. Option D is correct because if the database uses an internal DNS that resolves to old instances, updating it ensures connectivity. Option A is wrong because increasing instance count does not fix connectivity. Option C is wrong because CodeDeploy agent does not affect network connectivity. Option E is wrong because the deployment group is already configured; the issue is network.
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.
- ✓
Update the security group of the new instances to allow outbound traffic to the database security group.
Why this is correct
The new instances likely have different security groups that are not permitted to access the database.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Modify the CodeDeploy deployment group to include the database security group.
Why it's wrong here
Deployment groups do not manage security groups of external resources.
- ✓
Configure the database to use a DNS name that resolves to the new instances after the deployment.
Why this is correct
If the application connects using a DNS name that points to the old instances, updating it to point to the new instances ensures connectivity.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Increase the number of instances in the Auto Scaling group.
Why it's wrong here
More instances do not solve connectivity issues.
- ✗
Reinstall the CodeDeploy agent on the new instances.
Why it's wrong here
The agent is not related to database connectivity.
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.
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FAQ
Questions learners often ask
What does this DOP-C02 question test?
SDLC Automation — This question tests SDLC Automation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Update the security group of the new instances to allow outbound traffic to the database security group. — Option B is correct because the new instances need proper security group rules to access the database. Option D is correct because if the database uses an internal DNS that resolves to old instances, updating it ensures connectivity. Option A is wrong because increasing instance count does not fix connectivity. Option C is wrong because CodeDeploy agent does not affect network connectivity. Option E is wrong because the deployment group is already configured; the issue is network.
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.
About these practice questions
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Last reviewed: Jun 20, 2026
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.
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