The correct answer is to attach a permissions boundary to the IAM user. Permissions boundaries are a powerful IAM feature that sets the maximum permissions an identity-based policy can grant, effectively capping a user’s access regardless of what other policies they hold. This directly implements the principle of least privilege by ensuring that even if a policy accidentally grants broad access, the boundary prevents it from exceeding the defined limit. On the AWS Certified Security Specialty SCS-C02 exam, this concept tests your ability to distinguish between delegation of authority and enforcement of limits—a common trap is confusing permissions boundaries with service control policies (SCPs), which operate at the organizational level, not on individual users. Another frequent mistake is thinking resource-based policies or IAM groups can enforce boundaries, but they cannot restrict the effective permissions of a user’s own policies. Remember the memory tip: “Boundaries cap, policies grant”—the boundary is the ceiling, the policy is the floor.
SCS-C02 Management and Security Governance Practice Question
This SCS-C02 practice question tests your understanding of management and security governance. 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 security engineer notices that an IAM user has permissions that exceed their job requirements. The engineer wants to implement the principle of least privilege. Which IAM feature should be used to grant only the necessary permissions?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "least"
Why it matters: You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Attach a permissions boundary to the user
Permissions boundaries set the maximum permissions that an identity-based policy can grant. Option A is correct because it restricts permissions to a defined boundary. Option B (service control policies) applies to all accounts in an organization, not individual users. Option C (resource-based policies) are attached to resources, not users. Option D (IAM groups) do not enforce boundaries.
Key principle: Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Attach a permissions boundary to the user
Why this is correct
Permissions boundaries limit the maximum permissions the user can have.
Clue confirmation
The clue word "least" in the question point toward this answer.
Related concept
Authentication checks who the user is.
✗
Add the user to an IAM group with restricted permissions
Why it's wrong here
Groups only aggregate permissions; they do not enforce a boundary.
✗
Use a resource-based policy on the user
Why it's wrong here
Resource-based policies are attached to resources, not IAM users.
✗
Attach a service control policy (SCP) to the user's account
Why it's wrong here
SCPs apply to all principals in an account, not individual users.
Common exam traps
Common exam trap: authentication is not authorization
Logging in proves the user can authenticate. It does not automatically mean the user is allowed to enter privileged or configuration mode. Watch for AAA authorization, privilege level and command authorization details.
Detailed technical explanation
How to think about this question
This kind of question is testing the difference between identity and permission. A user may successfully log in to a router because authentication is working, but still fail to enter configuration mode because authorization is missing, misconfigured or mapped to a lower privilege level.
KKey Concepts to Remember
Authentication checks who the user is.
Authorization controls what the user is allowed to do after login.
Privilege levels affect access to EXEC and configuration commands.
AAA, TACACS+ and RADIUS can separate login success from command access.
TExam Day Tips
→Do not assume successful login means full administrative access.
→Look for words such as cannot enter configuration mode, privilege level, authorization or command access.
→Separate login problems from permission problems before choosing the answer.
Key takeaway
Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
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 Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related SCS-C02 questions on access control and AAA configuration.
Management and Security Governance — This question tests Management and Security Governance — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: Attach a permissions boundary to the user — Permissions boundaries set the maximum permissions that an identity-based policy can grant. Option A is correct because it restricts permissions to a defined boundary. Option B (service control policies) applies to all accounts in an organization, not individual users. Option C (resource-based policies) are attached to resources, not users. Option D (IAM groups) do not enforce boundaries.
What should I do if I get this SCS-C02 question wrong?
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related SCS-C02 questions on access control and AAA configuration.
Are there clue words in this question I should notice?
Yes — watch for: "least". You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
What is the key concept behind this question?
Authentication checks who the user is.
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