- A
Use Cloud NAT for outbound traffic to anonymize instance IP addresses in serial console logs.
Why wrong: Cloud NAT anonymizes outbound traffic IPs but does not affect serial console logs.
- B
Enable Private Google Access on the VPC subnet to restrict serial console log access to internal IPs only.
Why wrong: Private Google Access enables private access to Google APIs, not serial console log restriction.
- C
Remove the roles/iam.serviceAccountUser role from all users to prevent them from accessing serial console.
Why wrong: The roles/iam.serviceAccountUser role controls service account usage, not serial console access.
- D
Disable interactive serial console access for all instances that do not require it.
Correct. Disabling interactive serial console access prevents unauthorized access to serial console logs.
- E
Enable OS Login for the project to enforce SSH key management and prevent serial console access.
Why wrong: OS Login enforces SSH key management but does not prevent serial console access.
Secure Serial Console Logs with Private Google Access
This PCSE practice question tests your understanding of serial console access. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. A key principle to apply: serial Console Access. 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 security engineer is investigating an incident where an attacker gained access to a Compute Engine instance's serial console logs, which contained sensitive data. Which TWO actions should the engineer take to prevent this type of exposure in the future? (Choose TWO.)
Quick Answer
The answer is to disable interactive serial console access for instances that do not require it and to enable Private Google Access on the VPC subnet. Private Google Access ensures that serial console logs are transmitted exclusively over internal IP addresses, bypassing the public internet and preventing exposure to external attackers. This technical control restricts log access to resources within the VPC or connected on-premises networks, directly reducing the attack surface for data exfiltration. On the Google Professional Cloud Security Engineer exam, this scenario tests your understanding of network-level data exfiltration prevention, often appearing as a trap where candidates mistakenly focus on IAM permissions alone rather than network path controls. A common memory tip is to think of Private Google Access as a “private tunnel” for logs—if the data never touches the public internet, it cannot be intercepted there. Remember: disable serial console interactivity for non-essential instances, then lock down the log transport with Private Google Access.
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
Disable interactive serial console access for all instances that do not require it.
Disabling interactive serial console access for instances that do not require it directly prevents attackers from gaining access to serial console logs. Private Google Access does not restrict serial console log access; it enables private access to Google APIs. Other options like Cloud NAT, removing roles/iam.serviceAccountUser, or enabling OS Login do not effectively prevent serial console log exposure. Therefore, the only correct action is to disable interactive serial console access where not needed.
Key principle: Serial Console 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 for outbound traffic to anonymize instance IP addresses in serial console logs.
- ✗
Enable Private Google Access on the VPC subnet to restrict serial console log access to internal IPs only.
Why it's wrong here
Private Google Access enables private access to Google APIs, not serial console log restriction.
- ✗
Remove the roles/iam.serviceAccountUser role from all users to prevent them from accessing serial console.
Why it's wrong here
The roles/iam.serviceAccountUser role controls service account usage, not serial console access.
- ✓
Disable interactive serial console access for all instances that do not require it.
Why this is correct
Correct. Disabling interactive serial console access prevents unauthorized access to serial console logs.
Related concept
Serial Console Access
- ✗
Enable OS Login for the project to enforce SSH key management and prevent serial console access.
Why it's wrong here
OS Login enforces SSH key management but does not prevent serial console access.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Candidates often mistakenly believe that Private Google Access restricts serial console log access, but it actually provides private connectivity to Google APIs. Serial console access is controlled by IAM permissions and the serial console enablement setting.
Detailed technical explanation
How to think about this question
Serial console logs are streamed to Cloud Logging and can be accessed via the gcloud compute instances get-serial-port-output command or the Cloud Console. Private Google Access uses RFC 1918 addresses to route traffic to Google APIs through the VPC network, bypassing the public internet, which is critical for compliance with data residency or security policies. Disabling interactive serial console access (Option D) prevents attackers from using the serial console as an out-of-band attack vector, even if they have compromised IAM credentials.
KKey Concepts to Remember
- Serial Console Access
- Private Google Access
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Serial Console 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.
Visual reference
What to study next
Got this wrong? Here's your next step.
Review serial Console Access, then practise related PCSE questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this PCSE question test?
Serial Console Access
What is the correct answer to this question?
The correct answer is: Disable interactive serial console access for all instances that do not require it. — Disabling interactive serial console access for instances that do not require it directly prevents attackers from gaining access to serial console logs. Private Google Access does not restrict serial console log access; it enables private access to Google APIs. Other options like Cloud NAT, removing roles/iam.serviceAccountUser, or enabling OS Login do not effectively prevent serial console log exposure. Therefore, the only correct action is to disable interactive serial console access where not needed.
What should I do if I get this PCSE question wrong?
Review serial Console Access, then practise related PCSE questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Serial Console Access
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Last reviewed: Jun 30, 2026
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