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CV0-004 Practice Question: A cloud administrator is debugging a failed…
Network Topology
A cloud administrator is debugging a failed CloudFormation stack creation. The exhibit shows the stack events. What is the most likely cause of the failure?
⚠ Common exam trap
CompTIA often tests the ability to read CloudFormation stack events and correlate the failing resource with the specific error message, rather than assuming a generic failure like an incorrect AMI or instance type.
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
✓
The referenced security group does not exist in the chosen VPC.
The stack creation fails with a 'CREATE_FAILED' status on the security group resource, and the error message indicates that the security group does not exist in the specified VPC. This is a common issue when a CloudFormation template references a security group by ID or name that is not present in the target VPC, causing the resource creation to fail. The stack events show the security group resource as the point of failure, confirming that the referenced security group is missing.
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 instance type is not supported in the region.
Why it's wrong here
No error about instance type.
- ✗
The stack name already exists.
Why it's wrong here
Stack creation in progress, not duplicate.
- ✗
The AMI ID is incorrect.
Why it's wrong here
No AMI error.
- ✓
The referenced security group does not exist in the chosen VPC.
Why this is correct
The error explicitly mentions invalid groupId.
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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.