PCNE Implementing hybrid interconnectivity Practice Question
This PCNE practice question tests your understanding of implementing hybrid interconnectivity. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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.
Your company has a Dedicated Interconnect between on-premises and Google Cloud. After a maintenance window, some routes are missing from the on-premises side. On the Cloud Router, you see that the BGP session status is 'ESTABLISHED'. However, the route table on the on-premises router does not contain any of the VPC subnets. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The Cloud Router has an empty 'Advertised IP ranges' list
The BGP session is 'ESTABLISHED', confirming that the TCP connection and BGP peering are working correctly. However, the on-premises router is not receiving any VPC subnet routes because the Cloud Router's 'Advertised IP ranges' list is empty, meaning it is not advertising any routes to the peer. This is a common misconfiguration where the Cloud Router is configured to use custom route advertisements but the list of prefixes to advertise is left blank.
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.
✗
The Cloud Router is not configured to advertise any custom routes
Why it's wrong here
Cloud Router by default advertises VPC subnets, but custom route advertisement can be disabled.
✗
MD5 authentication is enabled but passwords differ
Why it's wrong here
Password mismatch would prevent session establishment.
✓
The Cloud Router has an empty 'Advertised IP ranges' list
Why this is correct
If the list is empty, no prefixes are advertised.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
BGP configuration mismatch on the on-premises router
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that an 'ESTABLISHED' BGP session guarantees that routes are being exchanged, but in reality, the session can be up while no prefixes are advertised due to missing or empty route advertisement configurations.
Detailed technical explanation
How to think about this question
In Google Cloud, a Cloud Router can use either 'global dynamic routing' (advertising all VPC subnets) or 'custom route advertisements' where you explicitly specify the prefixes to advertise. When using custom advertisements, if the 'Advertised IP ranges' list is empty, the Cloud Router sends no routes to the BGP peer, even though the BGP session is up. This is analogous to a 'network' statement missing in a traditional BGP configuration on Cisco IOS, where the BGP table is empty for the neighbor.
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
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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: The Cloud Router has an empty 'Advertised IP ranges' list — The BGP session is 'ESTABLISHED', confirming that the TCP connection and BGP peering are working correctly. However, the on-premises router is not receiving any VPC subnet routes because the Cloud Router's 'Advertised IP ranges' list is empty, meaning it is not advertising any routes to the peer. This is a common misconfiguration where the Cloud Router is configured to use custom route advertisements but the list of prefixes to advertise is left blank.
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: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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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