PCNE Implementing VPC Instances Practice Question
A company wants to allow traffic to a specific set of Compute Engine instances only from a single management instance that uses a service account. The management instance has the service account 'sa-mgmt@project.iam.gserviceaccount.com'. Which TWO firewall rule configurations can achieve this? (Choose TWO.)
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
✓
Set the source IP range to the internal IP of the management instance
Firewall rules can target instances by service account (using the 'target service accounts' field) and filter source traffic by service account (using the 'source service accounts' field). Both approaches can restrict traffic to only the management instance's service account.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Set the source IP range to the internal IP of the management instance
Why this is correct
This restricts traffic to that specific IP address.
- ✓
Set the source service account filter to 'sa-mgmt@project.iam.gserviceaccount.com'
Why this is correct
This filters incoming traffic to only allow traffic from instances with that service account.
- ✗
Set the priority to 65535 to ensure it is evaluated last
Why it's wrong here
Priority affects evaluation order but does not restrict traffic.
- ✗
Set the target tags to 'mgmt' and assign that tag to the management instance
Why it's wrong here
This would apply the rule to instances with the tag, but would not restrict the source.
- ✗
Set the target of the rule to the service account 'sa-mgmt@project.iam.gserviceaccount.com'
Why it's wrong here
This would apply the rule to instances with that service account, but the rule would allow traffic from any source, not just the management instance.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This PCNE practice question is part of Courseiva's free Google Cloud certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PCNE exam.