The answer is an IAM role and an instance profile. An EC2 instance profile is the container that allows an IAM role to be attached to an EC2 instance, enabling the instance to assume that role and retrieve temporary security credentials via the instance metadata service (IMDS). Without the instance profile, the IAM role cannot be directly assigned to the instance, making both components essential for granting permissions to EC2 instances in an Auto Scaling group. On the AWS Certified Security Specialty SCS-C02 exam, this concept tests your understanding of how to securely delegate permissions without embedding long-term credentials—a common trap is confusing the IAM role itself with the instance profile, or thinking a separate service like STS is required. Remember the mnemonic: "Role for permissions, Profile for attachment" to keep the two distinct.
SCS-C02 Identity and Access Management Practice Question
This SCS-C02 practice question tests your understanding of identity and access management. 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 developer wants to allow an IAM role to be assumed by an EC2 instance that is part of an Auto Scaling group. Which TWO AWS services or features are required? (Choose TWO.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Instance profile
An instance profile is required to attach an IAM role to an EC2 instance. When an EC2 instance is launched with an instance profile, the AWS credentials provider on the instance can retrieve temporary security credentials from the IAM role via the instance metadata service (IMDS). This allows the instance to assume the role and perform authorized API actions without embedding long-term credentials.
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.
✗
AWS Config
Why it's wrong here
AWS Config is for configuration monitoring, not for granting permissions.
✓
Instance profile
Why this is correct
The instance profile is the container for the role that can be attached to EC2 instances.
Related concept
Read the scenario before looking for a memorised answer.
✓
IAM role
Why this is correct
The role defines the permissions that the EC2 instance will have.
Related concept
Read the scenario before looking for a memorised answer.
✗
AWS CloudFormation
Why it's wrong here
CloudFormation can automate the creation of these resources but is not required.
✗
AWS Single Sign-On (SSO)
Why it's wrong here
SSO is for federated user access, not for EC2 instance roles.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse IAM roles with instance profiles, thinking a role can be directly attached to an EC2 instance, but the instance profile is the required intermediary container that enables the role to be assumed by the instance.
Detailed technical explanation
How to think about this question
Under the hood, when an EC2 instance is launched with an instance profile, the AWS credentials provider uses the IMDS (either IMDSv1 or IMDSv2) to call the `sts:AssumeRole` API action with the role associated with the instance profile. The returned temporary security credentials are automatically rotated and have a configurable duration (default 1 hour, max 6 hours). In Auto Scaling groups, the instance profile is specified in the launch template or launch configuration, ensuring every new instance automatically inherits the role's permissions.
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 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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Identity and Access Management — This question tests Identity and Access Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Instance profile — An instance profile is required to attach an IAM role to an EC2 instance. When an EC2 instance is launched with an instance profile, the AWS credentials provider on the instance can retrieve temporary security credentials from the IAM role via the instance metadata service (IMDS). This allows the instance to assume the role and perform authorized API actions without embedding long-term credentials.
What should I do if I get this SCS-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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