VA-003 Compare authentication methods Practice Question
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?
⚠ Common exam trap
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.
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
✓
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.
Answer analysis
Option-by-option breakdown
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.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This VA-003 practice question is part of Courseiva's free HashiCorp 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 VA-003 exam.