PCNE Implementing Hybrid Interconnectivity Practice Question
A company has a HA VPN gateway in Google Cloud with two tunnels to their on-premises router. They want to ensure that if one tunnel fails, all traffic automatically fails over to the other tunnel. What configuration is necessary on the on-premises router?
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
✓
Set a higher local preference on the primary tunnel
For failover, the on-premises router should prefer one tunnel over the other using BGP attributes like local preference or AS path prepending. Typically, one tunnel is primary and the other is backup. Both tunnels should be established with BGP sessions, and the on-premises router should learn the same routes from both, but with different local preference values to determine the primary path.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use AS path prepending on the primary tunnel to make it preferred
Why it's wrong here
AS path prepending makes a path less preferred; you would prepend on the backup tunnel.
- ✓
Set a higher local preference on the primary tunnel
Why this is correct
Higher local preference makes a route more preferred, so setting it on the primary tunnel ensures it is used when available.
- ✗
Configure the same MED value on both tunnels
Why it's wrong here
Same MED would not differentiate preference; equal paths might cause ECMP or instability.
- ✗
Configure ECMP to load balance across both tunnels
Why it's wrong here
ECMP is for load balancing, not failover.
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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.