- A
Replace the ALB with a Network Load Balancer (NLB).
Why wrong: NLB supports WebSockets but still requires connection draining.
- B
Use sticky sessions (session affinity) on the ALB.
Why wrong: Sticky sessions route users to the same instance but do not prevent disconnections when the instance is terminated.
- C
Enable connection draining on the ALB target group.
Connection draining allows existing connections to complete before the instance is deregistered.
- D
Use an Auto Scaling lifecycle hook to delay instance termination.
Why wrong: Lifecycle hooks delay termination but do not drain connections from ALB.
Question 1,093 of 1,746
SAP-C02 Continuous Improvement for Existing Solutions Practice Question
This SAP-C02 practice question tests your understanding of continuous improvement for existing solutions. 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 company runs a stateful web application on EC2 instances behind an Application Load Balancer (ALB). The application uses WebSockets for real-time communication. During scale-in events, users experience disconnections. How can the company maintain WebSocket connections during scaling?
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
✓
Enable connection draining on the ALB target group.
Option C is correct because connection draining on the ALB target group allows existing WebSocket connections to complete before the instance is terminated, preventing disconnections during scale-in. Option A is wrong because an NLB is not required for WebSockets; ALB supports WebSocket connections. Option B is wrong because sticky sessions alone do not prevent disconnections during scale-in. Option D is wrong because lifecycle hooks can delay termination but do not handle existing connections; connection draining is specifically designed for this purpose.
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.
- ✗
Replace the ALB with a Network Load Balancer (NLB).
Why it's wrong here
NLB supports WebSockets but still requires connection draining.
- ✗
Use sticky sessions (session affinity) on the ALB.
Why it's wrong here
Sticky sessions route users to the same instance but do not prevent disconnections when the instance is terminated.
- ✓
Enable connection draining on the ALB target group.
Why this is correct
Connection draining allows existing connections to complete before the instance is deregistered.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use an Auto Scaling lifecycle hook to delay instance termination.
Why it's wrong here
Lifecycle hooks delay termination but do not drain connections from ALB.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
What to study next
Got this wrong? Here's your next step.
Identify which SAP-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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Continuous Improvement for Existing Solutions — study guide chapter
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FAQ
Questions learners often ask
What does this SAP-C02 question test?
Continuous Improvement for Existing Solutions — This question tests Continuous Improvement for Existing Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable connection draining on the ALB target group. — Option C is correct because connection draining on the ALB target group allows existing WebSocket connections to complete before the instance is terminated, preventing disconnections during scale-in. Option A is wrong because an NLB is not required for WebSockets; ALB supports WebSocket connections. Option B is wrong because sticky sessions alone do not prevent disconnections during scale-in. Option D is wrong because lifecycle hooks can delay termination but do not handle existing connections; connection draining is specifically designed for this purpose.
What should I do if I get this SAP-C02 question wrong?
Identify which SAP-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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Last reviewed: Jun 20, 2026
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