The correct answer is to enable encryption at rest using AWS KMS and place the RDS database in a private subnet. Encryption at rest ensures that data stored on the underlying storage volumes, automated backups, read replicas, and snapshots are all encrypted using AWS Key Management Service, protecting against unauthorized physical access to the storage media. Placing the database in a private subnet without a public IP address prevents direct exposure to the internet, forcing all traffic through controlled network paths like a bastion host or VPN. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this question tests your understanding of the shared responsibility model and the difference between network security and data protection. A common trap is confusing IAM database authentication with encryption—IAM authentication is an access control method, not a security best practice for all scenarios, and it does not protect data at rest. Remember the mnemonic “Private and Encrypted” to recall that network isolation and data encryption are the two foundational pillars for securing RDS.
DOP-C02 Security and Compliance Practice Question
This DOP-C02 practice question tests your understanding of security and compliance. 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.
Which TWO are best practices for securing an Amazon RDS database? (Choose 2)
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
✓
Launch the RDS instance in a private subnet.
Option A (private subnet) and Option C (encryption at rest) are correct. Option B is wrong because public accessibility should be disabled. Option D is wrong because a single Availability Zone reduces availability, not security. Option E is wrong because IAM users are not used for database authentication directly; RDS supports IAM database authentication but it's not a best practice for all cases.
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.
✗
Enable public accessibility for easy management.
Why it's wrong here
Public accessibility increases exposure to attacks.
✗
Use a single Availability Zone to reduce complexity.
Why it's wrong here
This does not improve security; it reduces availability.
✓
Launch the RDS instance in a private subnet.
Why this is correct
Placing the database in a private subnet restricts direct internet access.
Clue confirmation
The clue word "best" in the question point toward this answer.
Direct IAM user access is not a standard practice; use IAM database authentication with caution.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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 DOP-C02 subnetting questions on CIDR, address ranges, and subnet selection.
Security and Compliance — This question tests Security and Compliance — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Launch the RDS instance in a private subnet. — Option A (private subnet) and Option C (encryption at rest) are correct. Option B is wrong because public accessibility should be disabled. Option D is wrong because a single Availability Zone reduces availability, not security. Option E is wrong because IAM users are not used for database authentication directly; RDS supports IAM database authentication but it's not a best practice for all cases.
What should I do if I get this DOP-C02 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 DOP-C02 subnetting questions on CIDR, address ranges, and subnet selection.
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?
CIDR notation defines the prefix length.
About these practice questions
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These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company has an Amazon RDS for MySQL database that stores sensitive data. The security team requires encryption at rest and in transit. Which combination of options meets these requirements?
easy
A.Use AWS Certificate Manager to issue a certificate for the RDS instance
B.Place the RDS instance in a private subnet and use VPC peering
✓ C.Enable encryption at rest on the RDS instance and enforce SSL connections
D.Use AWS KMS to encrypt the database before inserting data and decrypt on read
Why C: Encryption at rest is enabled by enabling RDS encryption. Encryption in transit is achieved by using SSL/TLS connections. Option A is correct. Option B (AWS KMS with client-side encryption) would encrypt data before sending but does not use RDS encryption. Option C (VPC peering) does not encrypt. Option D (AWS Certificate Manager) is for certificates but not directly for RDS encryption.
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This DOP-C02 practice question is part of Courseiva's free Amazon Web Services 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 DOP-C02 exam.
Question Discussion
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