The answer is that Cloud NAT allows fine-grained control over source IP addresses, which is one of its key benefits. This is correct because Cloud NAT translates the private IP addresses of instances in a VPC network to a single or pool of external IPs for outbound internet connectivity, while keeping those instances unreachable from the internet. By managing which external IPs are used, you can precisely control source IPs for outbound traffic, which is essential for security compliance and whitelisting with external services. On the Google Professional Cloud Network Engineer exam, this concept tests your understanding of how Cloud NAT differs from a public IP or a VPN—many candidates mistakenly think Cloud NAT provides inbound access or load balancing, but it strictly handles outbound-only traffic. A common trap is confusing Cloud NAT with Cloud Load Balancing; remember that NAT is for outbound, not inbound. Memory tip: think of NAT as a “one-way door” for private instances to reach the internet, with you controlling the door’s outward-facing address.
PCNE Configuring network services Practice Question
This PCNE practice question tests your understanding of configuring network services. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
Which TWO of the following are benefits of using Cloud NAT?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enables outbound traffic from instances without public IPs
Cloud NAT enables outbound connectivity from private instances that lack public IP addresses. It translates private source IPs to a single or a pool of external IPs, allowing instances to reach the internet while remaining unreachable from outside. This is essential for security and compliance in VPC networks.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Supports static IP addresses for all instances
Why it's wrong here
Cloud NAT uses a static IP for the gateway, not per-instance static IPs.
✓
Enables outbound traffic from instances without public IPs
Read the scenario before looking for a memorised answer.
✓
Allows fine-grained control over source IP addresses
Why this is correct
You can specify which source IPs are used for the NAT.
Related concept
Read the scenario before looking for a memorised answer.
✗
Provides inbound port forwarding
Why it's wrong here
Cloud NAT does not support inbound traffic; it is outbound-only.
✗
Automatically scales with the number of instances
Why it's wrong here
Scaling is automatic but this is inherent to the service, not a distinct benefit.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that Cloud NAT provides inbound connectivity or static IPs per instance, when in fact it is strictly outbound and uses a shared pool of IPs.
Detailed technical explanation
How to think about this question
Cloud NAT uses Cloud Router to dynamically allocate NAT IPs from a configured range, and it supports both manual and automatic NAT IP assignment. Under the hood, it performs source network address translation (SNAT) for TCP, UDP, and ICMP traffic, but does not support protocols like ESP or GRE. In a real-world scenario, if you have a private GKE cluster, Cloud NAT allows pods to pull images from Docker Hub without exposing them to inbound traffic.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Configuring network services — This question tests Configuring network services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enables outbound traffic from instances without public IPs — Cloud NAT enables outbound connectivity from private instances that lack public IP addresses. It translates private source IPs to a single or a pool of external IPs, allowing instances to reach the internet while remaining unreachable from outside. This is essential for security and compliance in VPC networks.
What should I do if I get this PCNE question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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