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Implementing a Virtual Private Cloud →mediumDrag & DropObjective-mapped

PCNE Implementing a Virtual Private Cloud Practice Question

This PCNE practice question tests your understanding of implementing a virtual private cloud. 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.

Drag and drop the steps to configure a Cloud NAT for private instances to access the internet into the correct order.

A
Create a Cloud Router in the region, then create a Cloud NAT gateway using that router, then assign static IP addresses to the NAT, then apply the NAT to the desired subnets, then test connectivity from a private instance.
This order follows the logical dependency: Cloud Router must exist before creating the NAT; NAT must exist before assigning IPs; NAT must be applied to subnets before testing. It ensures all prerequisites are met and the configuration works correctly.
B
Create a Cloud NAT gateway first, then create a Cloud Router, then assign IP addresses, then apply to subnets, then test connectivity.
Why wrong: Incorrect because a Cloud Router is required when creating a Cloud NAT. Creating the NAT first will fail as no router is specified.
C
Create a Cloud Router, then assign IP addresses to the NAT, then create the Cloud NAT, then apply to subnets, then test.
Why wrong: Incorrect because you cannot assign IP addresses to a NAT gateway before it is created. IP assignment is part of NAT configuration.
D
Create a Cloud Router, then create a Cloud NAT and apply it to subnets, then assign IP addresses, then test connectivity.
Why wrong: Incorrect because applying the NAT to subnets before assigning IP addresses may result in the NAT using ephemeral IPs instead of the desired static ones. The recommended order is to assign IPs before applying to subnets.

Full breakdown with real-world context →

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 a Cloud Router in the region, then create a Cloud NAT gateway using that router, then assign static IP addresses to the NAT, then apply the NAT to the desired subnets, then test connectivity from a private instance.

Cloud NAT requires a Cloud Router first. Then create NAT, assign IPs, and apply to subnets. Testing confirms internet access.

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 Router in the region, then create a Cloud NAT gateway using that router, then assign static IP addresses to the NAT, then apply the NAT to the desired subnets, then test connectivity from a private instance.
Why this is correct
This order follows the logical dependency: Cloud Router must exist before creating the NAT; NAT must exist before assigning IPs; NAT must be applied to subnets before testing. It ensures all prerequisites are met and the configuration works correctly.
Related concept
CIDR notation defines the prefix length.
✗
Create a Cloud NAT gateway first, then create a Cloud Router, then assign IP addresses, then apply to subnets, then test connectivity.
Why it's wrong here
Incorrect because a Cloud Router is required when creating a Cloud NAT. Creating the NAT first will fail as no router is specified.
✗
Create a Cloud Router, then assign IP addresses to the NAT, then create the Cloud NAT, then apply to subnets, then test.
Why it's wrong here
Incorrect because you cannot assign IP addresses to a NAT gateway before it is created. IP assignment is part of NAT configuration.
✗
Create a Cloud Router, then create a Cloud NAT and apply it to subnets, then assign IP addresses, then test connectivity.
Why it's wrong here
Incorrect because applying the NAT to subnets before assigning IP addresses may result in the NAT using ephemeral IPs instead of the desired static ones. The recommended order is to assign IPs before applying to subnets.

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?

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: Create a Cloud Router in the region, then create a Cloud NAT gateway using that router, then assign static IP addresses to the NAT, then apply the NAT to the desired subnets, then test connectivity from a private instance. — Cloud NAT requires a Cloud Router first. Then create NAT, assign IPs, and apply to subnets. Testing confirms internet access.

What should I do if I get this PCNE question wrong?

What is the key concept behind this question?

CIDR notation defines the prefix length.

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