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GCP Professional Cloud Security Engineer Practice Question

Your security team must stop Cloud Run services in the prod project from running container images unless they carry two signed attestations: one for a vulnerability scan and one for end-to-end QA. They will deploy the control in two phases: first, monitor violations without blocking deployments; later, block any new revision that lacks either attestation. All images reside in Artifact Registry, and the CI/CD pipeline already signs images at each gate. Which approach meets these goals using Google-recommended Binary Authorization practices?

  • Create two attestors (ScanGate and QAGate) and add them to a single project-wide Binary Authorization policy with requireAttestationsBy listing both attestors. Publish the policy in DRYRUN_AUDIT_LOG_ONLY mode for phase 1, monitor violations, then switch to ENFORCED_BLOCK_AND_AUDIT_LOG for phase 2.

  • Attach an IAM deny policy to the Artifact Registry repository to block pulls of unsigned images, run it in audit-only mode for phase 1, and enforce it for phase 2.

  • Create two separate Binary Authorization policies-one requiring the vulnerability-scan attestor and another requiring the QA attestor-enabling them in successive phases.

  • Enable Binary Authorization on each Cloud Run service and use an allowlist that includes only the trusted Artifact Registry repository for phase 1; remove the allowlist in phase 2.

GCP Professional Cloud Security Engineer
Managing operations
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