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CV0-004 Practice Question: Which TWO of the following are best practices…
Which TWO of the following are best practices when configuring a cloud-based virtual private cloud (VPC) for a multi-tier application?
⚠ Common exam trap
CompTIA often tests the misconception that simplicity (placing all instances in one subnet) is a best practice, when in fact proper segmentation is critical for security and compliance in multi-tier architectures.
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
✓
Place each application tier in a separate subnet.
Placing each application tier (e.g., web, application, database) in a separate subnet allows you to apply distinct network access control lists (NACLs) and security groups per tier. This segmentation enforces the principle of least privilege, ensuring that only the web tier can communicate with the application tier on specific ports, and only the application tier can reach the database tier. It also isolates failures and simplifies troubleshooting by containing traffic within defined network boundaries.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Place each application tier in a separate subnet.
Why this is correct
Separate subnets allow for network segmentation and security controls.
- ✗
Disable VPC flow logs to reduce costs.
Why it's wrong here
Flow logs provide valuable monitoring and troubleshooting information.
- ✗
Use the default security group for all instances.
Why it's wrong here
Default security groups may not provide least privilege.
- ✗
Place all instances in the same subnet for simplicity.
Why it's wrong here
This reduces security isolation and makes troubleshooting harder.
- ✓
Restrict SSH access to management IP addresses using security groups.
Why this is correct
This is a security best practice to limit attack surface.
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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.