Google PCA Ensure solution and operations reliability Practice Question
This PCA practice question tests your understanding of ensure solution and operations reliability. 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.
A company uses Cloud NAT to allow private instances to access the internet. They notice intermittent connectivity issues. What should they check first?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Cloud NAT gateway has at least one NAT IP address configured.
Intermittent connectivity issues when using Cloud NAT are most commonly caused by a lack of NAT IP addresses. Cloud NAT uses source network address translation (SNAT) to map private instance traffic to a public IP address; if the gateway has no NAT IP addresses configured, or if the number of concurrent connections exceeds the available port capacity of the assigned NAT IPs, packets are dropped, leading to intermittent failures. Checking that at least one NAT IP address is assigned is the first and most critical troubleshooting step.
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.
✓
Cloud NAT gateway has at least one NAT IP address configured.
Why this is correct
Without NATIPs, traffic cannot be translated, causing intermittent failures.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Cloud NAT router has a configured IP address range.
Why it's wrong here
IP ranges are needed but not the most common cause.
✗
Cloud NAT gateway is in the same region as the instances.
Why it's wrong here
Region mismatch can cause issues, but not the most likely first check.
✗
The VPC subnet has private Google access enabled.
Why it's wrong here
Private Google Access is for Google APIs, not general internet.
✗
The instances have external IP addresses assigned.
Why it's wrong here
If instances have external IPs, NAT is not needed.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that Cloud NAT requires a router with a configured IP range or that Private Google Access is needed for internet access, but the real first check is ensuring NAT IP addresses are assigned to the gateway.
Detailed technical explanation
How to think about this question
Cloud NAT performs port address translation (PAT) using a pool of NAT IP addresses and ephemeral source ports. Each NAT IP provides 64,512 ports per protocol (TCP/UDP), and if the number of concurrent connections exceeds this limit, new connections are dropped. Under the hood, Cloud NAT uses a VPC router to hold the NAT configuration, but the actual NAT IPs are allocated to the gateway; the router itself does not hold IP ranges. In real-world scenarios, intermittent connectivity often arises from port exhaustion when a single NAT IP is used for many instances, making it essential to monitor NAT IP usage and scale the pool.
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.
Ensure solution and operations reliability — This question tests Ensure solution and operations reliability — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Cloud NAT gateway has at least one NAT IP address configured. — Intermittent connectivity issues when using Cloud NAT are most commonly caused by a lack of NAT IP addresses. Cloud NAT uses source network address translation (SNAT) to map private instance traffic to a public IP address; if the gateway has no NAT IP addresses configured, or if the number of concurrent connections exceeds the available port capacity of the assigned NAT IPs, packets are dropped, leading to intermittent failures. Checking that at least one NAT IP address is assigned is the first and most critical troubleshooting step.
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.
Are there clue words in this question I should notice?
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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