The answer is to set up Cloud VPN or Dedicated Interconnect between the two VPCs, as these services establish encrypted or dedicated private paths that enable cross-region private IP communication using VPC peering principles. This is correct because VPC peering itself is a non-transitive, single-region connection in Google Cloud, so for cross-region private IP connectivity without traversing the public internet, you must use Cloud VPN (with dynamic routing) or Dedicated Interconnect to bridge the VPCs across regions, allowing internal IP addresses to route directly over Google’s global network backbone. On the Google Professional Cloud Network Engineer exam, this tests your understanding of VPC peering limitations versus hybrid connectivity options—a common trap is assuming VPC peering works across regions natively, but it does not in GCP; instead, remember that peering is regional and non-transitive. A helpful memory tip: “Peering is regional, VPN is global—bridge regions with a tunnel or a cable.”
PCNE Implementing a Virtual Private Cloud Practice Question
This PCNE practice question tests your understanding of implementing a virtual private cloud. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 designing a VPC with multiple subnets across two regions for high availability. They want to ensure that instances in different regions can communicate using internal IP addresses without traversing the public internet. Which TWO actions should they take? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Set up VPC peering between the VPCs in each region.
Option A is correct because VPC peering allows direct, private IP connectivity between two VPCs using the AWS global network backbone, without traversing the public internet. This enables instances in different regions to communicate using internal IP addresses, provided the VPCs have non-overlapping CIDR blocks and appropriate route table entries are configured.
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.
✓
Set up VPC peering between the VPCs in each region.
Why this is correct
VPC peering allows using internal IP addresses across regions.
Related concept
Read the scenario before looking for a memorised answer.
✓
Set up Cloud VPN or Dedicated Interconnect between the two VPCs.
Why this is correct
Cloud VPN or Interconnect enables private IP communication across regions.
Related concept
Read the scenario before looking for a memorised answer.
✗
Create firewall rules allowing all traffic from the other region's subnet CIDR.
Why it's wrong here
Firewall rules only permit traffic; they don't establish connectivity between separate VPCs.
✗
Configure instances to use external IP addresses for cross-region communication.
Why it's wrong here
External IP traffic traverses the internet, not internal IPs.
✗
Use a shared VPC to connect both regions.
Why it's wrong here
Shared VPC allows multiple projects to use the same VPC but does not connect separate VPCs across regions.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that firewall rules alone can enable cross-VPC communication, but candidates must remember that a Layer 3 path (via peering or VPN) is required first, and that shared VPCs are region-scoped, not cross-region.
Detailed technical explanation
How to think about this question
VPC peering uses the AWS global infrastructure to route traffic between VPCs without gateways or VPNs, relying on route table entries and security group rules. For cross-region peering, traffic stays on the AWS backbone, avoiding internet latency and exposure. In contrast, Cloud VPN or Dedicated Interconnect (Option B) also provides private connectivity but is typically used for on-premises to VPC connections or when VPC peering is not feasible due to overlapping CIDRs or organizational policies; however, both options are valid for cross-region private communication, making B also correct.
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.
Implementing a Virtual Private Cloud — This question tests Implementing a Virtual Private Cloud — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Set up VPC peering between the VPCs in each region. — Option A is correct because VPC peering allows direct, private IP connectivity between two VPCs using the AWS global network backbone, without traversing the public internet. This enables instances in different regions to communicate using internal IP addresses, provided the VPCs have non-overlapping CIDR blocks and appropriate route table entries are configured.
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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This PCNE 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 PCNE exam.
Question Discussion
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