The correct steps are to update the existing Cloud NAT gateway to enable flow logs and configure a log sink to export those logs to BigQuery. Cloud NAT flow logs enable audit capabilities by capturing detailed metadata about every outbound connection made from private instances through the gateway, including source IP, destination, and protocol, which is essential for security auditing. On the Google Professional Cloud Architect exam, this scenario tests your understanding that flow logs are a native toggle on the Cloud NAT resource itself, not a separate service, and that exporting to BigQuery is a separate but necessary step for long-term analysis and querying. A common trap is thinking you need to enable VPC Flow Logs instead, but those track internal traffic, not NAT outbound connections. Remember the mnemonic: “NAT logs for outbound, VPC logs for inbound and internal.”
Google PCA Practice Question: Analyze and optimize technical and business processes
This PCA practice question tests your understanding of analyze and optimize technical and business processes. 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.
A company is using Cloud NAT to allow instances in a private subnet to access the internet for updates. The security team wants to audit outbound connections. Which TWO steps should be taken to enable flow logs for Cloud NAT?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure a log sink to export Cloud NAT logs to BigQuery
Cloud NAT flow logs provide detailed records of outbound connections and are enabled directly on the Cloud NAT gateway itself. Option B is correct because configuring a log sink to export Cloud NAT logs to BigQuery is a valid step to audit outbound connections, but the primary step to enable logging is to update the existing Cloud NAT gateway to enable flow logs (Option E). Together, these two steps (B and E) allow you to capture and analyze outbound traffic for auditing.
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.
✗
Enable private Google access on the subnet
Why it's wrong here
Private Google Access does not provide outbound internet flow logs.
✓
Configure a log sink to export Cloud NAT logs to BigQuery
Why this is correct
Exporting to BigQuery enables analysis and auditing of the flow logs.
Related concept
Read the scenario before looking for a memorised answer.
✗
Enable VPC Flow Logs on the subnet
Why it's wrong here
VPC flow logs capture network traffic but not specifically NATgateway flows; also not the recommended way for Cloud NAT auditing.
✗
Create a new Cloud NAT gateway with logging enabled
Why it's wrong here
Creates a redundant gateway without addressing the existing one.
✓
Update the existing Cloud NAT gateway to enable flow logs
Why this is correct
Flow logs are enabled directly on the Cloud NATgateway resource.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse VPC Flow Logs with Cloud NAT flow logs, thinking that enabling VPC Flow Logs on the subnet will capture NAT traffic, but Cloud NAT flow logs are a distinct feature that must be enabled specifically on the NAT gateway itself.
Detailed technical explanation
How to think about this question
Cloud NAT flow logs are based on the NAT gateway's connection tracking table, recording each translated connection (source IP:port to destination IP:port) with timestamps and packet/byte counts. These logs are generated per minute and can be exported to BigQuery, Cloud Logging, or Pub/Sub for analysis. In real-world scenarios, enabling flow logs on an existing Cloud NAT gateway (via the `--enable-logging` flag in gcloud or the console) is the minimal change needed, avoiding the overhead of creating a new gateway and reconfiguring routes.
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
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this PCA question in full detail.
Analyze and optimize technical and business processes — This question tests Analyze and optimize technical and business processes — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Configure a log sink to export Cloud NAT logs to BigQuery — Cloud NAT flow logs provide detailed records of outbound connections and are enabled directly on the Cloud NAT gateway itself. Option B is correct because configuring a log sink to export Cloud NAT logs to BigQuery is a valid step to audit outbound connections, but the primary step to enable logging is to update the existing Cloud NAT gateway to enable flow logs (Option E). Together, these two steps (B and E) allow you to capture and analyze outbound traffic for auditing.
What should I do if I get this PCA 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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