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Implementing a Virtual Private Cloud →mediumMultiple ChoiceObjective-mapped

PCNE Implementing a Virtual Private Cloud Practice Question

This PCNE practice question tests your understanding of implementing a virtual private cloud. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.

Exhibit

$ gcloud compute networks subnets describe my-subnet --region=us-central1
creationTimestamp: '2023-01-01'
enableFlowLogs: false
fingerprint: ...
gatewayAddress: 10.0.0.1
id: ...
ipCidrRange: 10.0.0.0/24
kind: compute#subnetwork
name: my-subnet
network: https://www.googleapis.com/compute/v1/projects/my-project/global/networks/my-vpc
privateIpGoogleAccess: false
region: https://www.googleapis.com/compute/v1/projects/my-project/regions/us-central1
stackType: IPV4_ONLY

Refer to the exhibit. A VM in my-subnet without an external IP address cannot access Google APIs. What is the likely missing configuration?

Question 1mediummultiple choice
Review the full subnetting walkthrough →

Exhibit

$ gcloud compute networks subnets describe my-subnet --region=us-central1
creationTimestamp: '2023-01-01'
enableFlowLogs: false
fingerprint: ...
gatewayAddress: 10.0.0.1
id: ...
ipCidrRange: 10.0.0.0/24
kind: compute#subnetwork
name: my-subnet
network: https://www.googleapis.com/compute/v1/projects/my-project/global/networks/my-vpc
privateIpGoogleAccess: false
region: https://www.googleapis.com/compute/v1/projects/my-project/regions/us-central1
stackType: IPV4_ONLY

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 subnet.

The subnet has privateIpGoogleAccess set to false, which must be enabled for VMs without external IPs to access Google APIs via Private Google Access. Option A is correct. Option B is not needed because egress to 0.0.0.0/0 is allowed by default. Option C is not required for Private Google Access (Cloud NAT is for outbound internet to non-Google destinations). Option D is not missing; a default route exists as indicated by gatewayAddress.

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.

  • ✗

    Create a Cloud NAT.

    Why it's wrong here

    Cloud NAT is for internet access to non-Google destinations, not for Google APIs via Private Google Access.

  • ✗

    Add a firewall rule to allow egress to 0.0.0.0/0.

    Why it's wrong here

    Default egress rules already allow outbound traffic.

  • ✓

    Enable Private Google Access on the subnet.

    Why this is correct

    The setting privateIpGoogleAccess is currently false; enabling it allows access to Google APIs.

    Related concept

    CIDR notation defines the prefix length.

  • ✗

    Add a default route to the internet gateway.

    Why it's wrong here

    The subnet already has a gatewayAddress, implying a default route exists.

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.

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?

Implementing a Virtual Private Cloud — This question tests Implementing a Virtual Private Cloud — CIDR notation defines the prefix length..

What is the correct answer to this question?

The correct answer is: Enable Private Google Access on the subnet. — The subnet has privateIpGoogleAccess set to false, which must be enabled for VMs without external IPs to access Google APIs via Private Google Access. Option A is correct. Option B is not needed because egress to 0.0.0.0/0 is allowed by default. Option C is not required for Private Google Access (Cloud NAT is for outbound internet to non-Google destinations). Option D is not missing; a default route exists as indicated by gatewayAddress.

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

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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.