- A
gcloud compute interconnect list command.
Why wrong: This command lists interconnect attachments, not test connectivity.
- B
Cloud Monitoring dashboard for interconnect metrics.
Why wrong: Monitoring dashboards show metrics but do not test active connectivity.
- C
ping and traceroute from a Google Cloud VM to the on-premises IP.
ping and traceroute are the standard tools for testing connectivity.
- D
tcpdump on the on-premises router.
Why wrong: tcpdump is a packet capture tool, not a connectivity test tool.
Question 538 of 982
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.
A network engineer needs to test connectivity after setting up a Dedicated Interconnect VLAN attachment and BGP session. Which tool should they use to verify that Google Cloud can reach an on-premises IP address?
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
✓
ping and traceroute from a Google Cloud VM to the on-premises IP.
The standard tools to test connectivity are ping (ICMP echo) and traceroute (path discovery). They are used after BGP is established to verify end-to-end reachability.
Key principle: A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
gcloud compute interconnect list command.
Why it's wrong here
This command lists interconnect attachments, not test connectivity.
- ✗
Cloud Monitoring dashboard for interconnect metrics.
Why it's wrong here
Monitoring dashboards show metrics but do not test active connectivity.
- ✓
ping and traceroute from a Google Cloud VM to the on-premises IP.
Why this is correct
ping and traceroute are the standard tools for testing connectivity.
Related concept
Access ports place end devices into a single VLAN.
- ✗
tcpdump on the on-premises router.
Why it's wrong here
tcpdump is a packet capture tool, not a connectivity test tool.
Common exam traps
Common exam trap: an active trunk can still block the VLAN you need
A trunk being up does not prove every VLAN is crossing it. Check allowed VLAN lists, native VLAN mismatch, VLAN existence and access-port assignment.
Trap categories for this question
Command / output trap
This command lists interconnect attachments, not test connectivity.
Detailed technical explanation
How to think about this question
VLAN questions usually combine access-port and trunking clues. The key is to identify whether the issue is local to one switchport, caused by the trunk, or caused by the VLAN not existing where it needs to exist.
KKey Concepts to Remember
- Access ports place end devices into a single VLAN.
- Trunk ports carry multiple VLANs between switches.
- Allowed VLAN lists decide which VLANs can cross a trunk.
- Native VLAN mismatch can create confusing symptoms.
TExam Day Tips
- Use show vlan brief to verify access VLANs.
- Use show interfaces trunk to verify trunk state and allowed VLANs.
- Do not treat every same-VLAN issue as a routing problem.
Key takeaway
A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.
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.
Visual reference
What to study next
Got this wrong? Here's your next step.
Review VLAN allowed lists, native VLAN mismatch detection, and how to verify VLAN membership with show vlan brief and show interfaces trunk. Then practise related PCNE questions on switching, trunking, and access-port configuration.
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Implementing Hybrid Interconnectivity — study guide chapter
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Implementing Hybrid Interconnectivity practice questions
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FAQ
Questions learners often ask
What does this PCNE question test?
Implementing Hybrid Interconnectivity — This question tests Implementing Hybrid Interconnectivity — Access ports place end devices into a single VLAN..
What is the correct answer to this question?
The correct answer is: ping and traceroute from a Google Cloud VM to the on-premises IP. — The standard tools to test connectivity are ping (ICMP echo) and traceroute (path discovery). They are used after BGP is established to verify end-to-end reachability.
What should I do if I get this PCNE question wrong?
Review VLAN allowed lists, native VLAN mismatch detection, and how to verify VLAN membership with show vlan brief and show interfaces trunk. Then practise related PCNE questions on switching, trunking, and access-port configuration.
What is the key concept behind this question?
Access ports place end devices into a single VLAN.
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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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