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Root user vs IAM user in AWS - Quick Revision & Key Differences

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Recall & Review
beginner
What is the AWS root user?
The AWS root user is the account created when you first sign up for AWS. It has full access to all AWS services and resources in the account.
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beginner
What is an IAM user in AWS?
An IAM user is an identity created within an AWS account to allow controlled access to AWS services and resources. It has permissions assigned by policies.
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beginner
Why should you avoid using the root user for daily tasks?
Because the root user has unlimited access, using it daily increases security risks. It's safer to use IAM users with limited permissions for everyday work.
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beginner
How do IAM users get permissions in AWS?
IAM users get permissions through policies attached to them or to groups they belong to. These policies define what actions they can perform.
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beginner
What is a best practice regarding the AWS root user?
A best practice is to secure the root user with multi-factor authentication (MFA) and use it only for tasks that require root access.
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Which user has full access to all AWS services by default?
AGuest user
BRoot user
CIAM user
DService user
How do IAM users get their permissions?
ABy default, no permissions
BAutomatically full access
CBy logging in as root user
DThrough policies attached to them or their groups
What is a recommended security practice for the root user?
AEnable multi-factor authentication (MFA)
BUse it daily for all tasks
CDisable the root user
DShare root credentials with team
Why should you avoid using the root user for everyday tasks?
AIt cannot access AWS services
BIt has limited permissions
CIt increases security risks due to full access
DIt is slower than IAM users
What is an IAM user?
AAn identity with controlled permissions in AWS
BA temporary user created by AWS
CA guest user with no permissions
DA user with full AWS account ownership
Explain the difference between the AWS root user and an IAM user.
Think about who has full control and who has controlled access.
You got /4 concepts.
    Describe best practices for managing the AWS root user and IAM users.
    Focus on security and access control.
    You got /4 concepts.

      Practice

      (1/5)
      1. Which AWS user has full access to all resources and billing information by default?
      easy
      A. IAM user with admin permissions
      B. Federated user
      C. IAM user with read-only permissions
      D. Root user

      Solution

      1. Step 1: Understand AWS user types

        The root user is the original account owner with full control over all AWS services and billing.

      2. Step 2: Compare with IAM users

        IAM users have permissions assigned and do not have full access by default.

      3. Final Answer:

        Root user -> Option D

      4. Quick Check:

        Full access = Root user [OK]
      Hint: Root user = full control, IAM users = limited [OK]
      Common Mistakes:
      • Confusing IAM admin user with root user
      • Thinking IAM users have full billing access by default
      • Assuming federated users have root privileges
      2. Which of the following is the correct way to create an IAM user in AWS Management Console?
      easy
      A. Use AWS Billing dashboard to add a user
      B. Go to IAM > Users > Add user, then set permissions
      C. Log in as root user and create a new AWS account
      D. Create a new user under AWS Organizations

      Solution

      1. Step 1: Locate IAM user creation

        IAM users are created in the IAM service under Users > Add user.

      2. Step 2: Understand permissions assignment

        After adding a user, you assign permissions directly or via groups.

      3. Final Answer:

        Go to IAM > Users > Add user, then set permissions -> Option B

      4. Quick Check:

        IAM user creation = IAM console [OK]
      Hint: Create IAM users only in IAM console, not billing or orgs [OK]
      Common Mistakes:
      • Trying to create IAM users in Billing dashboard
      • Confusing AWS Organizations with IAM user creation
      • Creating new AWS accounts instead of IAM users
      3. If an IAM user tries to delete an S3 bucket but gets an Access Denied error, what is the most likely reason?
      medium
      A. The IAM user does not have delete permissions for the bucket
      B. The root user disabled S3 service
      C. The bucket is owned by another AWS account
      D. IAM users cannot delete S3 buckets

      Solution

      1. Step 1: Check IAM user permissions

        IAM users need explicit permissions to delete S3 buckets; lacking these causes Access Denied.

      2. Step 2: Evaluate other options

        Root user cannot disable S3 service; buckets owned by others can cause issues but usually different errors; IAM users can delete buckets if permitted.

      3. Final Answer:

        The IAM user does not have delete permissions for the bucket -> Option A

      4. Quick Check:

        Access Denied = missing permissions [OK]
      Hint: Access Denied usually means missing permission, not service disabled [OK]
      Common Mistakes:
      • Assuming root user disables services
      • Believing IAM users cannot delete buckets at all
      • Ignoring bucket ownership issues
      4. An administrator accidentally used the root user credentials for daily tasks and now wants to improve security. What should they do to fix this?
      medium
      A. Create IAM users with appropriate permissions and avoid using root user for daily tasks
      B. Delete the root user and use only IAM users
      C. Share root user credentials with team members for convenience
      D. Disable MFA on root user to simplify login

      Solution

      1. Step 1: Understand root user best practices

        Root user should be used only for account setup and billing, not daily tasks.

      2. Step 2: Implement IAM users for daily work

        Create IAM users with limited permissions for daily tasks to improve security.

      3. Final Answer:

        Create IAM users with appropriate permissions and avoid using root user for daily tasks -> Option A

      4. Quick Check:

        Use IAM users daily, root only for emergencies [OK]
      Hint: Use IAM users daily; keep root user locked down [OK]
      Common Mistakes:
      • Trying to delete root user (impossible)
      • Sharing root credentials widely
      • Disabling MFA on root user
      5. A company wants to restrict billing access to only the root user but allow IAM users to manage resources. Which AWS best practice should they follow?
      hard
      A. Create IAM users with billing permissions and avoid using root user
      B. Grant all IAM users full admin access including billing
      C. Use the root user only for billing and create IAM users with resource permissions
      D. Disable root user and use IAM users for all tasks

      Solution

      1. Step 1: Understand billing access control

        Billing access is sensitive and should be limited to the root user for security.

      2. Step 2: Assign resource management to IAM users

        IAM users should have permissions to manage resources but not billing.

      3. Final Answer:

        Use the root user only for billing and create IAM users with resource permissions -> Option C

      4. Quick Check:

        Billing = root only; resource management = IAM users [OK]
      Hint: Keep billing to root user; IAM users manage resources [OK]
      Common Mistakes:
      • Giving IAM users billing permissions unnecessarily
      • Disabling root user (not possible)
      • Granting full admin to all IAM users