VA-003 Explain Vault architecture Practice Question
A team wants to use Vault's AWS auth method to authenticate EC2 instances. Which architectural requirement must be met?
⚠ Common exam trap
HashiCorp often tests the misconception that Vault requires AWS API credentials or an IAM role for the AWS auth method, when in fact it only needs network access to the EC2 metadata endpoint to perform identity verification.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Vault must be able to reach the AWS metadata endpoint
The AWS auth method in Vault authenticates EC2 instances by verifying the instance's identity via the AWS metadata endpoint (http://169.254.169.254/latest/meta-data/). Vault must be able to reach this endpoint to retrieve the instance's PKCS7 signature, instance ID, and account ID, which are used to validate the instance's IAM role and ensure it matches the configured auth role. Without network access to the metadata endpoint, Vault cannot perform the cryptographic verification required for authentication.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Each EC2 instance must have an IAM role attached
Why it's wrong here
Optional, not required for auth method.
- ✗
Vault must have AWS API credentials configured
Why it's wrong here
Vault uses instance metadata, not credentials.
- ✗
Vault must be deployed on an EC2 instance in the same region
Why it's wrong here
Can be in any region with network access.
- ✓
Vault must be able to reach the AWS metadata endpoint
Why this is correct
Vault verifies instance identity via metadata.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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