Quick Answer
The answer is IAM role temporary credentials, along with access keys and SAML federation, as the three valid methods for authenticating to AWS APIs. Access keys provide long-term credentials for programmatic access, while IAM roles leverage AWS Security Token Service (STS) to generate temporary, scoped credentials that reduce the risk of key exposure. SAML federation enables external identity providers to authenticate users and grant them temporary AWS access without managing IAM users directly. On the AWS Certified Security Specialty SCS-C02 exam, this question tests your ability to distinguish between API authentication mechanisms and other access methods—a common trap is confusing SSH keys, which only authenticate to EC2 instances, or client certificates, which are not used for AWS API calls. Remember the mnemonic “AIS” for Access keys, IAM roles, and SAML to quickly recall the three valid options.
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.
Which THREE are valid methods for authenticating to AWS APIs? (Choose THREE.)
Access key ID and secret access key
Used for programmatic access to AWS APIs.
SSH key pair
Why wrong: Used for EC2 instance login, not AWS APIs.
SAML federation
Allows federated users to authenticate via SAML.
Client certificate
Why wrong: Not a standard authentication method for AWS APIs.
IAM role temporary credentials
Obtained via STS AssumeRole.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Access key ID and secret access key
The correct options are A, C, and E. Access keys, IAM roles (via STS), and SAML federation are valid authentication methods. Option B, SSH keys, are for EC2 instance access, not AWS APIs. Option D, client certificates, are not used for AWS API authentication.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Access key ID and secret access key
Why this is correct
Used for programmatic access to AWS APIs.
Related concept
Read the scenario before looking for a memorised answer.
SSH key pair
Why it's wrong here
Used for EC2 instance login, not AWS APIs.
SAML federation
Why this is correct
Allows federated users to authenticate via SAML.
Related concept
Read the scenario before looking for a memorised answer.
Client certificate
Why it's wrong here
Not a standard authentication method for AWS APIs.
IAM role temporary credentials
Why this is correct
Obtained via STS AssumeRole.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
Identify which SCS-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Identity and Access Management — study guide chapter
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FAQ
Identity and Access Management — This question tests Identity and Access Management — Read the scenario before looking for a memorised answer..
The correct answer is: Access key ID and secret access key — The correct options are A, C, and E. Access keys, IAM roles (via STS), and SAML federation are valid authentication methods. Option B, SSH keys, are for EC2 instance access, not AWS APIs. Option D, client certificates, are not used for AWS API authentication.
Identify which SCS-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 20, 2026
This SCS-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 SCS-C02 exam.
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