PCNE Implementing a Virtual Private Cloud Practice Question
Network Topology
Refer to the exhibit. You have two VPCs, vpc-a and vpc-b, with VPC peering configured and custom route import/export enabled. An instance in subnet-a (10.0.1.2) cannot ping an instance in subnet-b (10.0.2.2) using internal IP. Firewall rules are default (deny all ingress). What is the required action?
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
✓
Add a firewall rule allowing ICMP from 10.0.1.0/24 to 10.0.2.0/24.
Even with peering, firewall rules are needed to allow traffic. Default deny all ingress blocks the ping.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Add a firewall rule allowing ICMP from 10.0.1.0/24 to 10.0.2.0/24.
Why this is correct
This rule allows the ping traffic between the subnets.
- ✗
Add a static route for the peer range.
Why it's wrong here
Routes are already exchanged via peering; no static route needed.
- ✗
Enable Private Google Access.
Why it's wrong here
Private Google Access does not affect VPC-to-VPC traffic.
- ✗
Create a Cloud VPN tunnel.
Why it's wrong here
Peering already exists; VPN is not 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.