- A
The EC2 instance is in a private subnet with no route to the internet or a VPC endpoint for Secrets Manager
Without a route to the Secrets Manager service, the request will fail.
- B
The secret is in a different AWS account
Why wrong: The scenario says same account and region.
- C
The IAM role is not attached to the instance profile
Why wrong: The instance has a role, so it is attached.
- D
The VPC endpoint for Secrets Manager has a policy that denies access from the instance's security group
The endpoint policy can restrict access based on source VPC or security group.
- E
The secret is encrypted with a customer managed KMS key, and the IAM role does not have kms:Decrypt permission
Secrets Manager uses KMS for encryption; the role needs Decrypt permission on the key.
Quick Answer
The answer is the secret is encrypted with a customer managed KMS key, and the IAM role does not have kms:Decrypt permission. This is correct because when a secret is encrypted with a customer managed KMS key, the IAM role must explicitly be granted the kms:Decrypt action on that specific key, in addition to the secretsmanager:GetSecretValue permission; without it, the EC2 instance can retrieve the encrypted secret but cannot decrypt it. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this scenario tests your understanding of how Secrets Manager integrates with KMS for encryption, and it often appears alongside VPC endpoint policies and subnet routing as common pitfalls when troubleshooting EC2 access to Secrets Manager. A frequent trap is assuming the default AWS managed key (aws/secretsmanager) is always used, but customer managed keys require separate KMS permissions. Remember the mnemonic: “Get the secret, then decrypt the key” — two permissions, two services.
SOA-C02 Security and Compliance Practice Question
This SOA-C02 practice question tests your understanding of security and compliance. 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.
A SysOps administrator is troubleshooting an issue where an EC2 instance cannot pull secrets from AWS Secrets Manager. The instance has an IAM role with a policy that allows secretsmanager:GetSecretValue. The secret is in the same account and region. What are possible reasons for the failure? (Choose THREE.)
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
The EC2 instance is in a private subnet with no route to the internet or a VPC endpoint for Secrets Manager
Possible reasons include: the secret is encrypted with a KMS CMK that the role does not have access to (A), the VPC endpoint policy for Secrets Manager denies the action (B), and the instance is in a private subnet without a VPC endpoint or NAT gateway (C). Option D is wrong because cross-account is not needed. Option E is wrong because the instance profile is already associated with the role.
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.
- ✓
The EC2 instance is in a private subnet with no route to the internet or a VPC endpoint for Secrets Manager
Why this is correct
Without a route to the Secrets Manager service, the request will fail.
Related concept
CIDR notation defines the prefix length.
- ✗
The secret is in a different AWS account
Why it's wrong here
The scenario says same account and region.
- ✗
The IAM role is not attached to the instance profile
Why it's wrong here
The instance has a role, so it is attached.
- ✓
The VPC endpoint for Secrets Manager has a policy that denies access from the instance's security group
Why this is correct
The endpoint policy can restrict access based on source VPC or security group.
Related concept
CIDR notation defines the prefix length.
- ✓
The secret is encrypted with a customer managed KMS key, and the IAM role does not have kms:Decrypt permission
Why this is correct
Secrets Manager uses KMS for encryption; the role needs Decrypt permission on the key.
Related concept
CIDR notation defines the prefix length.
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.
Trap categories for this question
Scenario analysis trap
The scenario says same account and region.
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 SOA-C02 subnetting questions on CIDR, address ranges, and subnet selection.
- →
Security and Compliance — study guide chapter
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Security and Compliance practice questions
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FAQ
Questions learners often ask
What does this SOA-C02 question test?
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: The EC2 instance is in a private subnet with no route to the internet or a VPC endpoint for Secrets Manager — Possible reasons include: the secret is encrypted with a KMS CMK that the role does not have access to (A), the VPC endpoint policy for Secrets Manager denies the action (B), and the instance is in a private subnet without a VPC endpoint or NAT gateway (C). Option D is wrong because cross-account is not needed. Option E is wrong because the instance profile is already associated with the role.
What should I do if I get this SOA-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 SOA-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 20, 2026
This SOA-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 SOA-C02 exam.
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