- A
IAM: Controls access to AWS services and resources for users and roles.
IAM is used to manage access to AWS resources by defining users, groups, and roles with policies.
- B
Security Groups: Acts as a virtual firewall for EC2 instances.
Security groups are stateful firewalls that control inbound and outbound traffic to EC2 instances.
- C
KMS: Creates and manages encryption keys.
AWS Key Management Service (KMS) is used to create and manage cryptographic keys for data encryption.
- D
CloudTrail: Records API activity in your AWS account.
AWS CloudTrail logs all API calls made in your account for auditing and compliance purposes.
- E
IAM: Records API activity in your AWS account.
Why wrong: Incorrect — recording API activity is the function of CloudTrail, not IAM.
- F
Security Groups: Controls network traffic at the subnet level.
Why wrong: Incorrect — subnet-level traffic control is handled by Network ACLs, not security groups.
IAM, Security Groups, KMS, CloudTrail — AWS Security Services Compared
This DVA-C02 practice question tests your understanding of development with aws services. 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.
Match each AWS security feature to its function.
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
IAM: Controls access to AWS services and resources for users and roles.
The correct matches are IAM with access control, Security Groups with EC2 firewall, KMS with encryption key management, and CloudTrail with API auditing. Common confusions include mistaking IAM for CloudTrail and Security Groups for NACLs.
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.
- ✓
IAM: Controls access to AWS services and resources for users and roles.
Why this is correct
IAM is used to manage access to AWS resources by defining users, groups, and roles with policies.
Related concept
CIDR notation defines the prefix length.
- ✓
Security Groups: Acts as a virtual firewall for EC2 instances.
Why this is correct
Security groups are stateful firewalls that control inbound and outbound traffic to EC2 instances.
Related concept
CIDR notation defines the prefix length.
- ✓
KMS: Creates and manages encryption keys.
Why this is correct
AWS Key Management Service (KMS) is used to create and manage cryptographic keys for data encryption.
Related concept
CIDR notation defines the prefix length.
- ✓
CloudTrail: Records API activity in your AWS account.
Why this is correct
AWS CloudTrail logs all API calls made in your account for auditing and compliance purposes.
Related concept
CIDR notation defines the prefix length.
- ✗
IAM: Records API activity in your AWS account.
Why it's wrong here
Incorrect — recording API activity is the function of CloudTrail, not IAM.
- ✗
Security Groups: Controls network traffic at the subnet level.
Why it's wrong here
Incorrect — subnet-level traffic control is handled by Network ACLs, not security groups.
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 DVA-C02 subnetting questions on CIDR, address ranges, and subnet selection.
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FAQ
Questions learners often ask
What does this DVA-C02 question test?
Development with AWS Services — This question tests Development with AWS Services — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: IAM: Controls access to AWS services and resources for users and roles. — The correct matches are IAM with access control, Security Groups with EC2 firewall, KMS with encryption key management, and CloudTrail with API auditing. Common confusions include mistaking IAM for CloudTrail and Security Groups for NACLs.
What should I do if I get this DVA-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 DVA-C02 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: Jun 11, 2026
This DVA-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 DVA-C02 exam.
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