PCNE Implementing hybrid interconnectivity Practice Question
This PCNE practice question tests your understanding of implementing hybrid interconnectivity. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 three of the following are best practices for designing a highly available Dedicated Interconnect connection to Google Cloud? (Choose three.)
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Ensure that the on-premises routers are in different failure zones.
Option B is correct because deploying on-premises routers in different failure zones ensures that a single zone failure does not disrupt both BGP sessions. This aligns with Google Cloud's recommendation to use diverse failure domains for on-premises equipment to maintain high availability for Dedicated Interconnect.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 a single Cloud Router for both interconnect attachments.
Why it's wrong here
A single Cloud Router is a single point of failure; use separate routers for redundancy.
✓
Ensure that the on-premises routers are in different failure zones.
Why this is correct
Diverse on-premises routers prevent single point of failure.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Configure both connections to use the same BGP session.
Why it's wrong here
Using separate BGP sessions per connection provides redundancy.
✓
Use VLAN attachments in different regions to provide geographic redundancy.
Why this is correct
Geographic diversity protects against regional failures.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✓
Deploy two physical connections to different Google edge availability domains.
Why this is correct
This provides physical diversity against edge failures.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume a single Cloud Router or a single BGP session simplifies management, but this creates a single point of failure that violates high-availability design principles.
Detailed technical explanation
How to think about this question
Dedicated Interconnect uses BGP to exchange routes between on-premises and Google Cloud. Google's edge availability domains (EADs) are physically separate facilities within a metro; deploying two physical connections to different EADs (Option E) ensures that a facility-level outage does not impact both links. VLAN attachments in different regions (Option D) provide geographic redundancy, allowing traffic to fail over to a remote region if the primary region's interconnect fails.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
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
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
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
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Implementing hybrid interconnectivity — This question tests Implementing hybrid interconnectivity — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Ensure that the on-premises routers are in different failure zones. — Option B is correct because deploying on-premises routers in different failure zones ensures that a single zone failure does not disrupt both BGP sessions. This aligns with Google Cloud's recommendation to use diverse failure domains for on-premises equipment to maintain high availability for Dedicated Interconnect.
What should I do if I get this PCNE question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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