The answer is to place each application tier in a separate subnet and restrict SSH access to management IP addresses using security groups. This is correct because subnet segmentation enforces the principle of least privilege for multi-tier applications: by isolating the web, application, and database tiers into distinct subnets, you can apply granular network ACLs and security groups that control exactly which ports and protocols flow between tiers, preventing lateral movement if one tier is compromised. On the CompTIA Cloud+ CV0-004 exam, this concept tests your understanding of VPC design for security and fault isolation—a common trap is assuming a single flat subnet with security groups alone is sufficient, but proper segmentation requires separate subnets for each tier. A helpful memory tip is “tiers in tiers”: each application tier gets its own subnet tier, and each subnet tier gets its own access rules.
CV0-004 Operations and Support Practice Question
This CV0-004 practice question tests your understanding of operations and support. 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.
Which TWO of the following are best practices when configuring a cloud-based virtual private cloud (VPC) for a multi-tier application?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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.
Option A is correct because 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.
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.
✓
Place each application tier in a separate subnet.
Why this is correct
Separate subnets allow for network segmentation and security controls.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
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.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
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.
Detailed technical explanation
How to think about this question
In a VPC, subnets are associated with route tables and NACLs that operate at the subnet level (stateless), while security groups act as stateful firewalls at the instance level. For a multi-tier application, you typically create public subnets for web servers (with a route to an internet gateway) and private subnets for application and database servers (with no direct internet access). Security groups should reference each other by group ID (e.g., allowing the web security group to communicate with the app security group on TCP port 8080) rather than by CIDR blocks, which provides dynamic, scalable access control as instances scale in and out.
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.
TExam Day Tips
→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 security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Operations and Support — This question tests Operations and Support — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Place each application tier in a separate subnet. — Option A is correct because 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.
What should I do if I get this CV0-004 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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