- A
Grant the Cloud Build service account the 'compute.networkUser' role
Why wrong: This is needed for accessing VPC resources but not sufficient without the private connection.
- B
Configure Service Directory (private connection) between the pool and the VPC
A private pool needs a Service Directory connection to access VPC resources.
- C
Enable Cloud NAT on the VPC
Why wrong: NAT is for outbound internet access, not for private pool connectivity.
- D
Assign a public IP to the build instances
Why wrong: Private pools run on private infrastructure; they don't have public IPs.
Question 826 of 1,000
PCDE Practice Question: Building and Implementing CI/CD Pipelines for a Service
This PCDE practice question tests your understanding of building and implementing ci/cd pipelines for a service. 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 team is setting up a Cloud Build private pool to build Docker images that need access to resources in a VPC. After creating the private pool, builds fail with network errors. What is the most likely missing step?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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
✓
Configure Service Directory (private connection) between the pool and the VPC
Private pools require a Service Directory private connection (or VPC peering) to access VPC resources. Without that, the pool cannot reach the VPC.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Grant the Cloud Build service account the 'compute.networkUser' role
Why it's wrong here
This is needed for accessing VPC resources but not sufficient without the private connection.
- ✓
Configure Service Directory (private connection) between the pool and the VPC
Why this is correct
A private pool needs a Service Directory connection to access VPC resources.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
Enable Cloud NAT on the VPC
Why it's wrong here
NAT is for outbound internet access, not for private pool connectivity.
- ✗
Assign a public IP to the build instances
Why it's wrong here
Private pools run on private infrastructure; they don't have public IPs.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PCDE NAT questions on configuration and troubleshooting.
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Building and Implementing CI/CD Pipelines for a Service — study guide chapter
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FAQ
Questions learners often ask
What does this PCDE question test?
Building and Implementing CI/CD Pipelines for a Service — This question tests Building and Implementing CI/CD Pipelines for a Service — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Configure Service Directory (private connection) between the pool and the VPC — Private pools require a Service Directory private connection (or VPC peering) to access VPC resources. Without that, the pool cannot reach the VPC.
What should I do if I get this PCDE question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PCDE NAT questions on configuration and troubleshooting.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Last reviewed: Jul 4, 2026
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