Question 1,391 of 1,446
PCDE Practice Question: Manage a solution that can span multiple database technologies
A developer needs to connect to a Memorystore for Redis instance from a Compute Engine VM in the same VPC network. The Redis instance has AUTH enabled. What must the developer provide in the connection string?
⚠ Common exam trap
A common pitfall is selecting an IAM role (e.g., Memorystore User) instead of the Redis AUTH password because both are authentication mechanisms, but they operate at different layers: IAM controls access to the API, while AUTH controls data-plane access to Redis.
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
✓
The Redis AUTH password.
When AUTH is enabled on a Memorystore for Redis instance, the client must provide the AUTH password in the connection string (e.g., `redis://:password@host:6379`) or via the `AUTH` command after connecting. This password is set during instance creation and is required for authentication before any data commands can be executed. Without it, the Redis server will reject the connection with a `NOAUTH Authentication required` error.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The Redis AUTH password.
Why this is correct
AUTH requires a password to access the instance.
- ✗
The IAM role 'Memorystore User'.
Why it's wrong here
IAM roles control API access, not Redis AUTH.
- ✗
The client certificate and private key.
Why it's wrong here
Memorystore for Redis does not use client certificates for authentication.
- ✗
The service account key file.
Why it's wrong here
Service accounts are used for GCP API authentication, not Redis AUTH.
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Last reviewed: Jul 4, 2026
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