PCNE Implementing Hybrid Interconnectivity Practice Question
A company needs to connect their on-premises network to Google Cloud with high availability and load balancing across multiple tunnels. They plan to use HA VPN. Which TWO of the following are required to achieve active-active load balancing across multiple tunnels?
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
✓
Configure the on-premises router to enable ECMP
For active-active load balancing, Cloud Router BGP must advertise the same routes with identical attributes, and the on-premises router must support ECMP. Often, two tunnels are configured as a pair. The on-premises router must be configured to accept equal-cost routes.
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 one tunnel
Why it's wrong here
AS path prepending makes a path less preferred, not equal.
- ✓
Configure the on-premises router to enable ECMP
Why this is correct
ECMP allows the router to use multiple equal-cost paths.
- ✗
Use different MED values for each tunnel
Why it's wrong here
Different MED values would make one path preferred, not equal.
- ✓
Ensure the Cloud Router advertises the same routes with identical BGP attributes over all tunnels
Why this is correct
Identical attributes are necessary for ECMP to consider paths equal.
- ✗
Configure static routes instead of BGP
Why it's wrong here
Static routes cannot provide ECMP across dynamic tunnels effectively.
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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.