PCNE Implementing Hybrid Interconnectivity Practice Question
A multinational corporation is connecting five on-premises data centers to Google Cloud using Cloud Interconnect. Each data center has a dedicated 10 Gbps connection. They want to ensure that if one Interconnect fails, traffic is automatically redistributed across the remaining connections without manual intervention. Which solution meets this requirement?
⚠ Common exam trap
Google Cloud often tests the misconception that static routes or VPN tunnels can provide seamless automatic failover for high-bandwidth interconnects, but the correct approach requires dynamic BGP routing to react to link failures without manual intervention.
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
✓
Use a Cloud Router with BGP and establish multiple BGP sessions over each Interconnect
Cloud Router with BGP enables dynamic routing, allowing multiple BGP sessions over each Cloud Interconnect. When one interconnect fails, BGP withdraws the affected routes, and traffic is automatically redistributed across the remaining BGP sessions without manual intervention. This meets the requirement for automatic failover and load balancing across the five 10 Gbps connections.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Configure multiple VLAN attachments on a single Cloud Router and rely on link aggregation
Why it's wrong here
Link aggregation does not provide failover across separate Interconnects.
- ✗
Deploy Cloud VPN tunnels as backup and configure static routes with lower priority
Why it's wrong here
Cloud VPN requires manual failover unless using BGP, but that adds complexity.
- ✗
Configure VPC Network Peering between all data centers and Google Cloud
Why it's wrong here
VPC Network Peering is for VPC-to-VPC, not on-premises.
- ✓
Use a Cloud Router with BGP and establish multiple BGP sessions over each Interconnect
Why this is correct
BGP with ECMP allows automatic failover across multiple Interconnects.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.