PCNE Implementing VPC Instances Practice Question
An engineer needs to set up a firewall rule that allows health check probes from Google Cloud's health check ranges (130.211.0.0/22 and 35.191.0.0/16) to a backend instance group. The rule should apply only to instances with the 'backend' network tag. What is the correct configuration?
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
✓
Create an ingress rule with source IP ranges 130.211.0.0/22 and 35.191.0.0/16, and target tags 'backend'
Ingress firewall rules control incoming traffic. The rule must allow traffic from the health check source ranges to all instances (targets) with the tag 'backend'. Priority lower number means higher priority.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Create an ingress rule with destination IP ranges 130.211.0.0/22 and 35.191.0.0/16, and target tags 'backend'
Why it's wrong here
Ingress rules use source ranges, not destination ranges. Destination ranges are used in egress rules.
- ✓
Create an ingress rule with source IP ranges 130.211.0.0/22 and 35.191.0.0/16, and target tags 'backend'
Why this is correct
This ingress rule allows health check traffic from the specified source ranges to instances with the 'backend' tag.
- ✗
Create a route with next hop as the backend instance group
Why it's wrong here
Routes control packet forwarding, not firewall permissions. Health check probes require firewall rules to allow traffic.
- ✗
Create an egress rule with source IP ranges 130.211.0.0/22 and 35.191.0.0/16, and target tags 'backend'
Why it's wrong here
Egress rules control outgoing traffic. Health check probes are incoming, so an ingress rule is needed.
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JA
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.