PCNE Implementing Hybrid Interconnectivity Practice Question
A company is using Cloud VPN to connect to Google Cloud. They notice that traffic from their on-premises network to Google Cloud is not being routed correctly after a recent change. On the on-premises router, they verify that the BGP session is established and routes are received. Which step should they take next to troubleshoot?
⚠ Common exam trap
Google Cloud often tests the misconception that a working BGP session and tunnel status guarantee correct routing, but the real failure point is the propagation of learned routes into the VPC’s routing tables, which requires explicit verification of Cloud Router’s learned routes and advertisements.
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 the routes learned via BGP are being propagated to the VPC network by examining Cloud Router details
Since the BGP session is established and routes are received on the on-premises router, the issue is likely that those routes are not being propagated into the VPC network. Cloud Router acts as the BGP speaker for the VPC; even if the VPN tunnel is up and BGP peering is successful, the learned routes must be advertised into the VPC’s routing tables. Verifying Cloud Router details (e.g., using `gcloud compute routers get-status` or checking the Cloud Console) confirms whether the routes are being accepted and propagated, which directly addresses the routing failure.
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 the routes learned via BGP are being propagated to the VPC network by examining Cloud Router details
Why this is correct
Routes learned via BGP must be propagated to the VPC. Cloud Router shows advertised and learned routes.
- ✗
Check the on-premises firewall logs
Why it's wrong here
Firewall logs might show blocked traffic, but first confirm routing is correct.
- ✗
Disable and re-enable the VPN tunnel
Why it's wrong here
This is disruptive and may not resolve underlying routing issues.
- ✗
Check the tunnel status in Cloud Console
Why it's wrong here
Tunnel status might be up, but routing issues often stem from route propagation or firewall.
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JA
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.