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.
An organization has a Dedicated Interconnect with two VLAN attachments connected to two different edge availability domains (EADs). They want to use a single Cloud Router for both attachments. How many BGP sessions should be established on the Cloud Router?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
It depends on the redundancy requirements; typically two per attachment for active-active.
Option A is correct because with a Dedicated Interconnect using two VLAN attachments in different edge availability domains (EADs), the recommended best practice for high availability is to establish two BGP sessions per VLAN attachment (one active and one redundant) on the same Cloud Router, resulting in four sessions total. However, the question asks 'how many BGP sessions should be established' and the correct answer acknowledges that it depends on the redundancy requirements; typically two per attachment for active-active, but if active-passive is acceptable, fewer sessions may suffice. This flexibility makes 'It depends' the most accurate choice.
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.
✓
It depends on the redundancy requirements; typically two per attachment for active-active.
Why this is correct
For HA, each VLAN attachment should have two BGP sessions from two different on-premises routers, totaling four sessions.
Related concept
Read the scenario before looking for a memorised answer.
✗
Four: two per VLAN attachment.
Why it's wrong here
Four is a common design, but not necessarily the only correct answer.
✗
Two: one per VLAN attachment.
Why it's wrong here
While two sessions improve redundancy, best practice is to have at least two per attachment for full redundancy.
✗
One: one session per Cloud Router.
Why it's wrong here
One session would be a single point of failure.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume a fixed number of BGP sessions (e.g., two or four) without considering that the redundancy model (active-active vs. active-passive) dictates the session count, leading them to pick a definitive number rather than the flexible 'it depends' answer.
Detailed technical explanation
How to think about this question
In Google Cloud, a Cloud Router uses BGP to exchange routes with an on-premises router over VLAN attachments. Each VLAN attachment in a Dedicated Interconnect connects to a different edge availability domain (EAD) to provide physical diversity. For active-active redundancy, two BGP sessions per attachment (one primary, one backup) are typically configured to handle failover and load balancing, but the exact number depends on whether the organization requires active-active or active-passive behavior. The BGP session count is independent of the Cloud Router's capacity; the router can support multiple sessions as long as the BGP timers and route limits are properly tuned.
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: It depends on the redundancy requirements; typically two per attachment for active-active. — Option A is correct because with a Dedicated Interconnect using two VLAN attachments in different edge availability domains (EADs), the recommended best practice for high availability is to establish two BGP sessions per VLAN attachment (one active and one redundant) on the same Cloud Router, resulting in four sessions total. However, the question asks 'how many BGP sessions should be established' and the correct answer acknowledges that it depends on the redundancy requirements; typically two per attachment for active-active, but if active-passive is acceptable, fewer sessions may suffice. This flexibility makes 'It depends' the most accurate choice.
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.
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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