Google ACE Setting Up a Cloud Solution Environment Practice Question

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 Compute Engine API is already enabled.

  Why it's wrong here

  If the Compute Engine API were already enabled, the gcloud services enable command would not return a permission or billing error; it is idempotent and would simply output a success message such as "Operation finished successfully" or "Not change service config". An already-enabled service does not block re-enabling, nor does it trigger the underlying billing-account check to fail. Therefore, this state cannot explain the reported error.

• ✗

  The user needs to authenticate again.

  Why it's wrong here

  Failed or expired authentication produces a distinct class of errors like "ERROR: (gcloud.auth.login) You have not performed a login" or a 401/403 authentication error with a login hint, not a "Permission denied" or "Billing is required" message. Re-authenticating only refreshes OAuth credentials and does not alter the project's billing-account association or the IAM roles of the authenticated principal. Thus, re-authentication would not resolve a billing-related constraint.

• ✗

  The user does not have the serviceusage.services.enable permission.

  Why it's wrong here

  The error is not due to missing IAM permission because the user acting on the project holds the roles/editor (or owner) predefined role, which explicitly includes the serviceusage.services.enable permission on the project. If that permission were missing, the Service Usage API would return an error stating "Permission denied on resource" or "Permission serviceusage.services.enable denied for the resource". Moreover, the serviceusage.services.enable permission is separate from billing-related permissions such as billing.resources.linked, which are not required to issue the enable command itself.

• ✓

  The project does not have a billing account associated.

  Why this is correct

  Enabling the Compute Engine API requires the project to have a billing account associated with it, because even though Compute Engine offers a free tier, the service's resource management, quotas, and metering are tied to billing to prevent abuse and allow for usage tracking. When a project has no billing account, the Service Usage API returns an error like "Billing account must be linked to project" or "Billing is required for usage", and this occurs regardless of the user's IAM role or authentication state. Associating a billing account at the project level—through the Cloud Console or the gcloud billing projects link command—is the prerequisite that resolves this error.

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