- A
Configure Cloud NAT for the on-premises network.
Why wrong: Cloud NAT is for outbound internet access, not inbound to VM internal IPs.
- B
Enable Private Google Access on the VPC subnet where the VM resides.
Private Google Access allows on-premises to access Google APIs and services, not arbitrary VM internal IPs.
- C
Assign a global static external IP to the VM.
Why wrong: Assigning a global static external IP would expose the VM to the internet, which is not the requirement.
- D
Configure Cloud DNS forwarding to the on-premises DNS servers.
Why wrong: Cloud DNS forwarding is used for DNS resolution, not for IP-level connectivity.
Question 578 of 1,000
easyMultiple ChoiceObjective-mapped
PCNE Practice Question: Allow on-premises servers to access a Google…
This PCNE practice question tests your understanding of pcne exam topics. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. 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.
You need to allow on-premises servers to access a Google Cloud VM's internal IP without using a public IP. The on-premises network is connected via Cloud VPN. What configuration is required on the Google Cloud side?
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
✓
Enable Private Google Access on the VPC subnet where the VM resides.
None of the provided options are correct. To allow on-premises servers to access a Google Cloud VM's internal IP over Cloud VPN, no special Google Cloud-side configuration is required beyond ensuring that the VPC subnet route is advertised to the on-premises network via Cloud Router and that firewall rules allow the traffic. Private Google Access is for accessing Google APIs, not VM internal IPs. Cloud NAT is for outbound traffic. A global static external IP exposes the VM externally. Cloud DNS forwarding is for DNS resolution, not IP reachability.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Configure Cloud NAT for the on-premises network.
- ✓
Enable Private Google Access on the VPC subnet where the VM resides.
- ✗
Assign a global static external IP to the VM.
Why it's wrong here
Assigning a global static external IP would expose the VM to the internet, which is not the requirement.
- ✗
Configure Cloud DNS forwarding to the on-premises DNS servers.
Why it's wrong here
Cloud DNS forwarding is used for DNS resolution, not for IP-level connectivity.
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
- CIDR notation defines the prefix length.
- Block size helps identify subnet boundaries.
- Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
- The required host count determines the smallest suitable subnet.
TExam Day Tips
- Write the block size before choosing the subnet.
- Check whether the question asks for hosts, subnets or a specific address range.
- Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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 block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related PCNE subnetting questions on CIDR, address ranges, and subnet selection.
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FAQ
Questions learners often ask
What does this PCNE question test?
CIDR notation defines the prefix length.
What is the correct answer to this question?
The correct answer is: Enable Private Google Access on the VPC subnet where the VM resides. — None of the provided options are correct. To allow on-premises servers to access a Google Cloud VM's internal IP over Cloud VPN, no special Google Cloud-side configuration is required beyond ensuring that the VPC subnet route is advertised to the on-premises network via Cloud Router and that firewall rules allow the traffic. Private Google Access is for accessing Google APIs, not VM internal IPs. Cloud NAT is for outbound traffic. A global static external IP exposes the VM externally. Cloud DNS forwarding is for DNS resolution, not IP reachability.
What should I do if I get this PCNE question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related PCNE subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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Last reviewed: Jun 24, 2026
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.
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