CV0-004 Troubleshooting Practice Question
A cloud application returns HTTP 503 errors during high traffic. The application runs on VMs behind a load balancer. Which action is most likely to resolve the 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
✓
Add additional VMs to the backend pool.
Adding VMs increases the overall capacity to handle high traffic, directly addressing the 503 errors caused by overload. Option A is incorrect because restarting only one VM does not increase capacity; it might briefly disrupt service. Option B is incorrect because lowering the DNS TTL affects how clients resolve the domain, not the backend capacity. Option C is incorrect because increasing the health check interval only delays detection of unhealthy VMs, which does not prevent overload.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Restart the web server service on one VM.
Why it's wrong here
Restarting one VM won't help if all are overloaded.
- ✗
Change the DNS TTL to a lower value.
Why it's wrong here
DNS TTL affects caching, not server capacity.
- ✗
Increase the health check interval on the load balancer.
Why it's wrong here
Longer interval doesn't reduce load.
- ✓
Add additional VMs to the backend pool.
Why this is correct
Scaling out increases capacity to handle traffic.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CV0-004 practice question is part of Courseiva's free CompTIA 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 CV0-004 exam.