This PCNE practice question tests your understanding of implementing hybrid interconnectivity. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. 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.
Which TWO configurations provide high availability for Dedicated Interconnect? (Choose two.)
Two connections to different PoPs.
Geographic redundancy for higher availability.
A single circuit with L2 redundancy.
Why wrong: L2 redundancy alone is insufficient for HA.
Using Cloud NAT for failover.
Why wrong: Cloud NAT does not provide interconnect redundancy.
A single connection from one provider.
Why wrong: Single point of failure.
Two connections to the same PoP.
Redundancy within the same location.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Two connections to different PoPs.
Option A is correct because connecting to two different Points of Presence (PoPs) provides geographic redundancy; if one PoP fails, traffic can be rerouted through the other. Option E is correct because two connections to the same PoP provide link-level redundancy; if one circuit fails, the other can continue carrying traffic, and BGP can be used to load-balance or failover between them.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Two connections to different PoPs.
Why this is correct
Geographic redundancy for higher availability.
Related concept
Read the scenario before looking for a memorised answer.
A single circuit with L2 redundancy.
Why it's wrong here
L2 redundancy alone is insufficient for HA.
Using Cloud NAT for failover.
Why it's wrong here
Cloud NAT does not provide interconnect redundancy.
A single connection from one provider.
Why it's wrong here
Single point of failure.
Two connections to the same PoP.
Why this is correct
Redundancy within the same location.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Google Cloud often tests the misconception that a single circuit with L2 redundancy (like LACP) is sufficient for high availability, but for Dedicated Interconnect, true HA requires multiple physical circuits (either to the same PoP or different PoPs) with BGP-based failover.
Detailed technical explanation
Dedicated Interconnect uses BGP sessions over VLAN attachments to exchange routes; with two connections to different PoPs, you can configure separate BGP sessions and use AS-path prepending or local preference to influence traffic flow. In a real-world scenario, if one PoP experiences a fiber cut, BGP timers (e.g., hold time of 90 seconds) will detect the failure and withdraw routes, allowing the second connection to take over. Under the hood, Google Cloud uses a multi-homed BGP design where each interconnect link is a separate Layer 2 circuit, and redundancy relies on BGP path selection rather than STP or LACP.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
What to study next
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FAQ
Implementing hybrid interconnectivity — This question tests Implementing hybrid interconnectivity — Read the scenario before looking for a memorised answer..
The correct answer is: Two connections to different PoPs. — Option A is correct because connecting to two different Points of Presence (PoPs) provides geographic redundancy; if one PoP fails, traffic can be rerouted through the other. Option E is correct because two connections to the same PoP provide link-level redundancy; if one circuit fails, the other can continue carrying traffic, and BGP can be used to load-balance or failover between them.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 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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