- A
Verify that VPC Network Peering is established between the Cloud Build private pool's service producer VPC and the customer VPC, and that routes to on-premises are present.
Private pools require peering; missing peering stops traffic.
- B
Verify that the Cloud Build service account has the dns.networks.bindPrivateZone permission.
Why wrong: DNS permissions are needed for private zones, but the error is connection refused, not DNS resolution.
- C
Check that the Cloud Build service account has the storage.objectViewer role on the Artifactory bucket.
Why wrong: Artifactory is not a GCS bucket; the error is network, not permissions.
- D
Ensure that Cloud NAT is configured in the private pool's VPC.
Why wrong: Cloud NAT is for internet egress; on-premises is accessed via VPN/Interconnect.
Quick Answer
The answer is to verify that VPC Network Peering is established between the Cloud Build private pool's service producer VPC and the customer VPC, and that routes to on-premises are present. This is correct because the 'Connection refused' error when fetching from an on-premises Artifactory indicates that the private pool's worker VMs, which live in a Google-managed VPC, cannot route traffic to your on-premises network. Without active VPC peering and proper route propagation via Cloud VPN or Dedicated Interconnect, the packets are dropped at the boundary, not simply blocked by a firewall. On the Google Professional Cloud DevOps Engineer exam, this scenario tests your understanding of how private pools isolate build execution from the public internet, making VPC peering a mandatory bridge rather than an optional feature. A common trap is assuming a firewall rule alone will fix the issue, but the root cause is the missing network path. Remember the mnemonic: "Peering first, then routing; no peering, no routing."
PCDOE Building and implementing CI/CD pipelines Practice Question
This PCDOE practice question tests your understanding of building and implementing ci/cd pipelines. 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.
An organization uses Cloud Build with a private pool to build container images that require access to on-premises Artifactory. After moving to a new VPC, builds fail with 'Connection refused' when fetching dependencies. What is the best step to troubleshoot?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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
Verify that VPC Network Peering is established between the Cloud Build private pool's service producer VPC and the customer VPC, and that routes to on-premises are present.
The error 'Connection refused' indicates that the Cloud Build private pool's worker VMs cannot reach the on-premises Artifactory server. Private pools are deployed in a Google-managed service producer VPC that must be connected to the customer VPC via VPC Network Peering. Without this peering and the correct routes to the on-premises network (e.g., via Cloud VPN or Dedicated Interconnect), traffic from the private pool is dropped, causing the connection refusal.
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.
- ✓
Verify that VPC Network Peering is established between the Cloud Build private pool's service producer VPC and the customer VPC, and that routes to on-premises are present.
Why this is correct
Private pools require peering; missing peering stops traffic.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Verify that the Cloud Build service account has the dns.networks.bindPrivateZone permission.
Why it's wrong here
DNS permissions are needed for private zones, but the error is connection refused, not DNS resolution.
- ✗
Check that the Cloud Build service account has the storage.objectViewer role on the Artifactory bucket.
Why it's wrong here
Artifactory is not a GCS bucket; the error is network, not permissions.
- ✗
Ensure that Cloud NAT is configured in the private pool's VPC.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse connectivity issues with IAM permissions or misapply Cloud NAT, thinking it provides outbound access to on-premises, when in reality private pools require VPC peering and proper routing to reach non-Google Cloud endpoints.
Detailed technical explanation
How to think about this question
Cloud Build private pools use a service producer VPC that is peered with the customer VPC. For on-premises access, the customer VPC must have routes (e.g., via Cloud Router and VPN tunnels) that direct traffic to the on-premises network, and those routes must be propagated to the peered service producer VPC. The 'Connection refused' error typically occurs at the TCP layer when the destination host is unreachable or the port is not open, often due to missing routes or firewall rules blocking traffic from the private pool's IP range (e.g., 10.8.x.x).
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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.
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Building and implementing CI/CD pipelines — study guide chapter
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Building and implementing CI/CD pipelines practice questions
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FAQ
Questions learners often ask
What does this PCDOE question test?
Building and implementing CI/CD pipelines — This question tests Building and implementing CI/CD pipelines — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Verify that VPC Network Peering is established between the Cloud Build private pool's service producer VPC and the customer VPC, and that routes to on-premises are present. — The error 'Connection refused' indicates that the Cloud Build private pool's worker VMs cannot reach the on-premises Artifactory server. Private pools are deployed in a Google-managed service producer VPC that must be connected to the customer VPC via VPC Network Peering. Without this peering and the correct routes to the on-premises network (e.g., via Cloud VPN or Dedicated Interconnect), traffic from the private pool is dropped, causing the connection refusal.
What should I do if I get this PCDOE 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: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 11, 2026
This PCDOE practice question is part of Courseiva's free Google Cloud certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PCDOE exam.
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