- A
Place the database in a private subnet and use a security group to allow traffic only from the application tier
Private subnets have no internet gateway, and security groups can restrict access to only the application tier.
- B
Encrypt the database connection using TLS
Why wrong: Encryption protects data in transit but does not restrict network access.
- C
Use a VPN to connect the application tier to the database
Why wrong: A VPN is not necessary within the same VPC.
- D
Place the database in a public subnet with restrictive security groups
Why wrong: A public subnet has a route to the internet, which is not desired.
Question 575 of 997
CV0-004 Security Practice Question
This CV0-004 practice question tests your understanding of security. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 cloud architect is designing a multi-tier application. The application tier needs to access a database, but the database should not be reachable from the internet. Which network security control should be used?
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 the database in a private subnet and use a security group to allow traffic only from the application tier
Placing the database in a private subnet with no direct internet route ensures it is not reachable from the internet. Security groups can then allow inbound traffic only from the application tier's security group.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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 the database in a private subnet and use a security group to allow traffic only from the application tier
- ✗
Encrypt the database connection using TLS
Why it's wrong here
Encryption protects data in transit but does not restrict network access.
- ✗
Use a VPN to connect the application tier to the database
Why it's wrong here
A VPN is not necessary within the same VPC.
- ✗
Place the database in a public subnet with restrictive security groups
Why it's wrong here
A public subnet has a route to the internet, which is not desired.
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
- CIDR notation defines the prefix length.
- Block size helps identify subnet boundaries.
- Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
- The required host count determines the smallest suitable subnet.
TExam Day Tips
- Write the block size before choosing the subnet.
- Check whether the question asks for hosts, subnets or a specific address range.
- Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Real-world example
How this comes up in practice
A network engineer segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.
Visual reference
What to study next
Got this wrong? Here's your next step.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related CV0-004 subnetting questions on CIDR, address ranges, and subnet selection.
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FAQ
Questions learners often ask
What does this CV0-004 question test?
Security — This question tests Security — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Place the database in a private subnet and use a security group to allow traffic only from the application tier — Placing the database in a private subnet with no direct internet route ensures it is not reachable from the internet. Security groups can then allow inbound traffic only from the application tier's security group.
What should I do if I get this CV0-004 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related CV0-004 subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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Last reviewed: Jul 4, 2026
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.
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