This VA-003 practice question tests your understanding of compare authentication methods. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 team wants to allow applications to authenticate to Vault without storing any secrets in configuration files. The applications run on AWS EC2 instances with an IAM role attached. Which Vault authentication method leverages the EC2 instance metadata to obtain credentials?
GCP IAM authentication
Why wrong: Designed for GCP, not AWS.
Userpass authentication
Why wrong: Requires a password stored in config.
AppRole authentication
Why wrong: Requires an initial secret_id that must be distributed.
AWS IAM authentication
Uses EC2 instance metadata to sign a request, no secrets stored.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
AWS IAM authentication
AWS IAM authentication (option D) is correct because it allows applications running on EC2 instances with an attached IAM role to authenticate to Vault without storing any secrets. The Vault client uses the EC2 instance metadata service (IMDS) to retrieve the instance identity document and its signature, which are then presented to Vault. Vault verifies these credentials against the AWS API, confirming the instance's identity and IAM role, thereby enabling secure, secretless 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.
GCP IAM authentication
Why it's wrong here
Designed for GCP, not AWS.
Userpass authentication
Why it's wrong here
Requires a password stored in config.
AppRole authentication
Why it's wrong here
Requires an initial secret_id that must be distributed.
AWS IAM authentication
Why this is correct
Uses EC2 instance metadata to sign a request, no secrets stored.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
HashiCorp often tests the distinction between authentication methods that require pre-shared secrets (like AppRole) versus those that leverage cloud instance metadata (like AWS IAM), leading candidates to mistakenly choose AppRole because it is commonly associated with machine authentication.
Detailed technical explanation
Under the hood, the AWS IAM auth method in Vault uses the EC2 instance's PKCS#7-signed identity document from the instance metadata service (http://169.254.169.254/latest/dynamic/instance-identity/pkcs7). Vault validates this document by calling the AWS STS and EC2 APIs to verify the instance ID, account ID, and IAM role, then issues a Vault token bound to that identity. A subtle behavior is that the auth method can also be configured to require a specific IAM role ARN or AMI ID, adding fine-grained access control beyond just the instance's existence.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
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FAQ
Compare authentication methods — This question tests Compare authentication methods — Read the scenario before looking for a memorised answer..
The correct answer is: AWS IAM authentication — AWS IAM authentication (option D) is correct because it allows applications running on EC2 instances with an attached IAM role to authenticate to Vault without storing any secrets. The Vault client uses the EC2 instance metadata service (IMDS) to retrieve the instance identity document and its signature, which are then presented to Vault. Vault verifies these credentials against the AWS API, confirming the instance's identity and IAM role, thereby enabling secure, secretless authentication.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
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