The answer is to use an IAM group for each job function, attach appropriate managed policies to the group, and add users to the group. This is the most secure and efficient way to enforce least privilege with IAM groups because it centralizes permission management—when a policy is updated on the group, every member inherits the change automatically, eliminating the need to modify individual user permissions. On the AWS Certified Security Specialty SCS-C02 exam, this concept tests your understanding of scalable access control versus the common trap of attaching policies directly to users or using inline policies, which are harder to audit and maintain. A frequent distractor is the suggestion to create custom policies for each user, but that violates both efficiency and the principle of least privilege by introducing drift. Memory tip: think of IAM groups as “job function buckets”—pour the right managed policy into the bucket, then drop users in, and permissions flow without spillage.
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 security engineer is reviewing an AWS account and notices that multiple IAM users have full administrative access. The company policy requires that users have only the permissions necessary to perform their job. What is the MOST secure and efficient way to enforce this policy?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use an IAM group for each job function, attach appropriate managed policies to the group, and add users to the group.
Using IAM groups and attaching managed policies to them allows centralized permission management and simplifies the principle of least privilege.
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.
✗
Create an IAM policy that denies all actions except those specifically allowed, and attach it to each user.
Why it's wrong here
This is not efficient as it requires managing policies per user.
✓
Use an IAM group for each job function, attach appropriate managed policies to the group, and add users to the group.
Why this is correct
This is the best practice for managing permissions at scale.
Related concept
Authentication checks who the user is.
✗
Use an SCP in AWS Organizations to deny all actions by default.
Why it's wrong here
SCPs are for organizational boundaries, not for granular user permissions.
✗
Assign an inline policy to each user that specifies allowed actions.
Why it's wrong here
Inline policies are not reusable and harder to audit.
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.
Identity and Access Management — This question tests Identity and Access Management — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: Use an IAM group for each job function, attach appropriate managed policies to the group, and add users to the group. — Using IAM groups and attaching managed policies to them allows centralized permission management and simplifies the principle of least privilege.
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.
What is the key concept behind this question?
Authentication checks who the user is.
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Question Discussion
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