- A
MED (Multi-Exit Discriminator)
Why wrong: MED is used to influence inbound traffic to an AS, not outbound traffic from on-premises to GCP.
- B
AS path prepending
Why wrong: AS path prepending influences inbound traffic by making the path appear longer. It does not affect outbound traffic from on-premises to GCP.
- C
Origin attribute
Why wrong: The Origin attribute indicates how a route was learned (IGP, EGP, or incomplete) but does not prioritize traffic between multiple tunnels.
- D
Local Preference (LP)
Local Preference is used to influence outbound traffic within an AS. Setting a higher value on the preferred tunnel directs traffic from on-premises to GCP through that tunnel.
Question 871 of 1,000
PCNE Local Preference Practice Question
This PCNE practice question tests your understanding of implementing hybrid interconnectivity. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. A key principle to apply: local Preference. 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.
An organization is using Cloud VPN with dynamic routing (BGP) to connect their on-premises network to Google Cloud. They want to prioritize traffic from on-premises to GCP over one VPN tunnel when multiple tunnels are available. Which BGP attribute should they configure on their 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
✓
Local Preference (LP)
Local Preference (LP) is a BGP attribute that influences outbound traffic from an AS. When configuring multiple VPN tunnels, setting a higher Local Preference on the preferred tunnel will cause the on-premises router to choose that tunnel for traffic destined to GCP. AS path prepending, on the other hand, is used to influence inbound traffic by making a route less preferred; it does not affect outbound path selection from the on-premises network.
Key principle: Local Preference
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
MED (Multi-Exit Discriminator)
Why it's wrong here
MED is used to influence inbound traffic to an AS, not outbound traffic from on-premises to GCP.
- ✗
AS path prepending
Why it's wrong here
AS path prepending influences inbound traffic by making the path appear longer. It does not affect outbound traffic from on-premises to GCP.
- ✗
Origin attribute
Why it's wrong here
The Origin attribute indicates how a route was learned (IGP, EGP, or incomplete) but does not prioritize traffic between multiple tunnels.
- ✓
Local Preference (LP)
Why this is correct
Local Preference is used to influence outbound traffic within an AS. Setting a higher value on the preferred tunnel directs traffic from on-premises to GCP through that tunnel.
Related concept
Local Preference
Common exam traps
Common exam trap: answer the scenario, not the keyword
A common mistake is confusing BGP attributes that affect inbound vs. outbound traffic. AS path prepending influences inbound traffic to the router, while Local Preference influences outbound traffic. For traffic from on-premises to GCP, use Local Preference.
Detailed technical explanation
How to think about this question
Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Local Preference
- AS path prepending
- MED (Multi-Exit Discriminator)
- BGP path selection
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
Local Preference
Real-world example
How this comes up in practice
A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
What to study next
Got this wrong? Here's your next step.
Review local Preference, then practise related PCNE questions on the same topic to reinforce the concept.
- →
Implementing Hybrid Interconnectivity — study guide chapter
Learn the concepts, then practise the questions
- →
Implementing Hybrid Interconnectivity practice questions
Targeted practice on this topic area only
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FAQ
Questions learners often ask
What does this PCNE question test?
Implementing Hybrid Interconnectivity — This question tests Implementing Hybrid Interconnectivity — Local Preference.
What is the correct answer to this question?
The correct answer is: Local Preference (LP) — Local Preference (LP) is a BGP attribute that influences outbound traffic from an AS. When configuring multiple VPN tunnels, setting a higher Local Preference on the preferred tunnel will cause the on-premises router to choose that tunnel for traffic destined to GCP. AS path prepending, on the other hand, is used to influence inbound traffic by making a route less preferred; it does not affect outbound path selection from the on-premises network.
What should I do if I get this PCNE question wrong?
Review local Preference, then practise related PCNE questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Local Preference
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Last reviewed: Jul 4, 2026
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.
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