The correct answer is that HA VPN supports both active-active and active-passive modes, and it requires two Cloud VPN gateways. In active-active mode, both tunnels forward traffic simultaneously, providing load balancing and full utilization of bandwidth, while in active-passive mode, one tunnel remains as a standby, only taking over if the primary tunnel fails. This distinction is critical for the Google Professional Cloud Network Engineer exam, which often tests your understanding of how HA VPN modes map to different high-availability requirements—active-active for throughput-sensitive workloads, active-passive for failover scenarios. A common trap is assuming a single gateway suffices, but HA VPN always mandates two gateways for redundancy. Remember the mnemonic: “Two gateways, two modes—both active for speed, one passive for need.”
PCNE Implementing hybrid interconnectivity Practice Question
This PCNE practice question tests your understanding of implementing hybrid interconnectivity. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
It supports both active-active and active-passive modes.
Option C is correct because HA VPN supports both active-active and active-passive modes. In active-active mode, both tunnels forward traffic simultaneously, while in active-passive mode, one tunnel is used as a standby. This flexibility allows HA VPN to meet different high-availability and load-balancing requirements.
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.
✗
Both VPN gateways must be in the same region.
Why it's wrong here
Gateways can be in different regions for geographic redundancy.
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that HA VPN requires both gateways in the same region or that it supports static routing, but the correct understanding is that HA VPN uses dynamic routing (BGP) and allows gateways in different regions.
Detailed technical explanation
How to think about this question
HA VPN uses two Cloud VPN gateways, each with two interfaces, to create two tunnels (active-active or active-passive) for redundancy. The gateways exchange BGP routes over the tunnels, and the active-active mode uses ECMP (Equal-Cost Multi-Path) to load-balance traffic across both tunnels. In a real-world scenario, if one tunnel fails, BGP withdraws the routes, and traffic automatically shifts to the remaining tunnel without manual intervention.
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 hybrid interconnectivity — This question tests Implementing hybrid interconnectivity — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: It supports both active-active and active-passive modes. — Option C is correct because HA VPN supports both active-active and active-passive modes. In active-active mode, both tunnels forward traffic simultaneously, while in active-passive mode, one tunnel is used as a standby. This flexibility allows HA VPN to meet different high-availability and load-balancing requirements.
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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Question Discussion
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