The answer is to enable Binary Authorization on the GKE cluster, create Attestations for images that pass vulnerability scanning and signing in Cloud Build, and configure admission control to require those attestations. This is correct because Binary Authorization acts as a gatekeeper for your GKE clusters, enforcing a policy that only signed and vulnerability-scanned container images from a trusted artifact registry can be deployed. By integrating Cloud Build to automatically create attestations after scanning and signing, you ensure that any image lacking these verifications is blocked at admission, with all attempts logged for audit. On the Google Professional Cloud Security Engineer exam, this scenario tests your understanding of supply chain security controls, often appearing as a trap where candidates confuse network tools like Cloud NAT or access controls like IAP with image enforcement. Remember the key chain: build, scan, sign, attest, then deploy—if any link is missing, Binary Authorization denies the pod.
PCSE Practice Question: Managing operations in a cloud solution environment
This PCSE practice question tests your understanding of managing operations in a cloud solution environment. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A large financial institution runs a critical application on Google Kubernetes Engine (GKE) clusters. Their security policy requires that all container images must be scanned for vulnerabilities and must come from a trusted artifact registry. They use Cloud Build to automatically build images from a CI/CD pipeline and push them to Artifact Registry. They want to enforce that only images that have passed vulnerability scanning and are signed can be deployed to the GKE cluster. Currently, they have set up Cloud Build to automatically tag images with a 'latest' tag on successful build, but they need a mechanism to prevent deployment of unsigned or vulnerable images. They also want to audit any attempts to deploy non-compliant images. What should they do?
Use Cloud IAP to block nodes from pulling non-compliant images.
Why wrong: IAP is for user authentication, not image control.
D
Enable Binary Authorization on the GKE cluster, create Attestations for images that pass vulnerability scanning and signing in Cloud Build, and configure admission control to require attestations.
Binary Authorization enforces that only attested images can be deployed.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable Binary Authorization on the GKE cluster, create Attestations for images that pass vulnerability scanning and signing in Cloud Build, and configure admission control to require attestations.
Option D is correct because combining Binary Authorization with Attestations from vulnerability and signing enables enforcement. Option A is incorrect because Cloud Nat is for outbound traffic, not image enforcement. Option B is incorrect because GKE policy does not natively enforce image contracts. Option C is incorrect because IAP is for access, not for image verification.
Key principle: Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Use Cloud NAT to control which images can be pulled by GKE nodes.
Configure GKE policy to only allow images from a specific Artifact Registry repository and enable vulnerability scanning.
Why it's wrong here
GKE cannot enforce image signing natively.
✗
Use Cloud IAP to block nodes from pulling non-compliant images.
Why it's wrong here
IAP is for user authentication, not image control.
✓
Enable Binary Authorization on the GKE cluster, create Attestations for images that pass vulnerability scanning and signing in Cloud Build, and configure admission control to require attestations.
Why this is correct
Binary Authorization enforces that only attested images can be deployed.
Related concept
Authentication checks who the user is.
Common exam traps
Common exam trap: authentication is not authorization
Logging in proves the user can authenticate. It does not automatically mean the user is allowed to enter privileged or configuration mode. Watch for AAA authorization, privilege level and command authorization details.
Detailed technical explanation
How to think about this question
This kind of question is testing the difference between identity and permission. A user may successfully log in to a router because authentication is working, but still fail to enter configuration mode because authorization is missing, misconfigured or mapped to a lower privilege level.
KKey Concepts to Remember
Authentication checks who the user is.
Authorization controls what the user is allowed to do after login.
Privilege levels affect access to EXEC and configuration commands.
AAA, TACACS+ and RADIUS can separate login success from command access.
TExam Day Tips
→Do not assume successful login means full administrative access.
→Look for words such as cannot enter configuration mode, privilege level, authorization or command access.
→Separate login problems from permission problems before choosing the answer.
Key takeaway
Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Real-world example
How this comes up in practice
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Got this wrong? Here's your next step.
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related PCSE questions on access control and AAA configuration.
Managing operations in a cloud solution environment — This question tests Managing operations in a cloud solution environment — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: Enable Binary Authorization on the GKE cluster, create Attestations for images that pass vulnerability scanning and signing in Cloud Build, and configure admission control to require attestations. — Option D is correct because combining Binary Authorization with Attestations from vulnerability and signing enables enforcement. Option A is incorrect because Cloud Nat is for outbound traffic, not image enforcement. Option B is incorrect because GKE policy does not natively enforce image contracts. Option C is incorrect because IAP is for access, not for image verification.
What should I do if I get this PCSE question wrong?
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related PCSE questions on access control and AAA configuration.
What is the key concept behind this question?
Authentication checks who the user is.
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