The answer is that Cloud HA VPN supports using multiple tunnels for ECMP when configured with dynamic routing via BGP. This is correct because Cloud HA VPN inherently requires two interfaces per gateway, each connected to a separate Cloud Router, which allows multiple BGP sessions to establish active-active tunnels. With ECMP, traffic is load-balanced across these tunnels, maximizing throughput and providing seamless failover if one tunnel or interface fails. On the Google Professional Cloud Network Engineer exam, this concept tests your understanding of how Cloud HA VPN achieves high availability through redundancy at the gateway and router level, not just through tunnel count. A common trap is assuming a single Cloud Router suffices for HA, but the architecture demands two routers to avoid a single point of failure. Remember the memory tip: “Two routers, two interfaces, one ECMP” — that triad is the key to Cloud HA VPN’s resilience with BGP.
PCNE Implementing hybrid interconnectivity Practice Question
This PCNE practice question tests your understanding of implementing hybrid interconnectivity. 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.
Which THREE are true regarding Cloud HA VPN when used with dynamic routing (BGP)? (Choose three.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Cloud HA VPN requires two interfaces per VPN gateway.
Option C is correct because Cloud HA VPN requires two interfaces per VPN gateway to provide high availability and redundancy. Each gateway interface connects to a separate Cloud Router, enabling active-active failover and ensuring continuous connectivity if one interface or tunnel fails.
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 HA VPN requires two Cloud Routers in the same region for redundancy.
Why it's wrong here
A single Cloud Router can handle BGP sessions for both tunnels, two Cloud Routers are not mandatory.
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 Cloud HA VPN requires multiple Cloud Routers for redundancy, when in fact it uses multiple interfaces on a single Cloud Router, and that custom BGP timers are allowed, whereas Google Cloud enforces fixed timers for stability.
Detailed technical explanation
How to think about this question
Cloud HA VPN uses two external interfaces per gateway, each with its own public IP address, and establishes two tunnels to the peer gateway. BGP sessions are established over these tunnels using link-local addresses (169.254.x.x) to avoid IP address conflicts and simplify routing. ECMP (Equal-Cost Multi-Path) is supported across multiple tunnels, allowing load balancing and increased throughput.
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: Cloud HA VPN requires two interfaces per VPN gateway. — Option C is correct because Cloud HA VPN requires two interfaces per VPN gateway to provide high availability and redundancy. Each gateway interface connects to a separate Cloud Router, enabling active-active failover and ensuring continuous connectivity if one interface or tunnel fails.
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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