PCNE Implementing VPC Instances Practice Question
An engineer needs to deploy a VM that acts as a internet gateway for other instances in the same VPC. The VM must have IP forwarding enabled and must be able to accept traffic on multiple NICs. Which TWO actions are required? (Choose 2)
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 firewall rules to allow traffic to the VM's NICs.
To use a VM as a gateway, IP forwarding must be enabled on the VM. Additionally, firewall rules must allow ingress traffic to the VM's NICs that will forward traffic. The VM itself must have routes pointing to it as next hop.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Disable the VM's source/destination check.
Why it's wrong here
In GCP, IP forwarding already disables source/destination check; no separate action needed.
- ✓
Create firewall rules to allow traffic to the VM's NICs.
Why this is correct
Must allow ingress traffic to be forwarded.
- ✓
Enable IP forwarding on the VM instance.
Why this is correct
Required for the VM to forward packets.
- ✗
Create a Cloud NAT gateway.
Why it's wrong here
Not required; the VM itself acts as a gateway.
- ✗
Assign an external IP to each NIC.
Why it's wrong here
External IPs are not necessary for forwarding.
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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.