The correct answer is that the vPC domain will continue to operate but with reduced reliability. This is because the keepalive link serves as a secondary heartbeat mechanism, used solely to detect a dual-active or split-brain scenario when the peer link fails; a consistency check failure on the keepalive link does not disrupt data forwarding or the primary peer-link communication. On the Cisco DCCOR and CCNP Data Center Core 350-601 exam, this question tests your understanding of the vPC control plane’s layered redundancy—specifically that the keepalive is not involved in data-plane traffic, so its failure does not cause an outage, but it removes the safety net that prevents a catastrophic split-brain condition. A common trap is assuming any vPC failure halts operations, when in fact only peer-link failures trigger a primary/secondary election. Remember the memory tip: “Keepalive is the backup heartbeat—if it fails, the heart still beats, but the backup defibrillator is gone.”
350-601 Network Practice Question
This 350-601 practice question tests your understanding of network. 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.
In a vPC domain, a consistency check failure is observed for the vPC keepalive link. What is the impact on the vPC domain operation?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The vPC domain will continue to operate but with reduced reliability.
The vPC keepalive link is used as a secondary heartbeat to detect dual-active scenarios when the peer link fails. A consistency check failure on the keepalive link does not directly affect data forwarding; the vPC domain continues to operate, but the loss of this redundancy mechanism reduces reliability because the switches can no longer reliably detect a split-brain condition without the peer link.
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 vPC peer link will be suspended.
Why it's wrong here
Peer link suspension occurs only if the peer link itself fails or if the keepalive fails and the peer link also fails.
✗
The secondary switch will shutdown its vPC member ports.
Why it's wrong here
This occurs if the keepalive fails AND the peer link fails, but not automatically.
✓
The vPC domain will continue to operate but with reduced reliability.
Why this is correct
The keepalive is a secondary monitoring mechanism; its loss increases risk of split-brain if the peer link fails.
Related concept
Read the scenario before looking for a memorised answer.
✗
Both switches will independently forward traffic via the vPC peer link.
Why it's wrong here
Without keepalive, the secondary may think primary is down and take over, causing split-brain.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between the keepalive link and the peer link; the trap here is that candidates assume any consistency check failure will suspend the vPC domain, but only failures on the peer link or critical parameters (like vPC VLAN consistency) cause suspension, while keepalive failures merely degrade redundancy.
Detailed technical explanation
How to think about this question
The vPC keepalive link uses a Layer 3 path (typically a dedicated VLAN or management interface) with UDP packets to exchange heartbeat messages. A consistency check failure on the keepalive link might be caused by mismatched vPC domain IDs, incorrect source/destination IPs, or MTU issues; the vPC domain will still forward traffic, but the loss of this out-of-band heartbeat means the switches rely solely on the peer link for dual-active detection, increasing the risk of a split-brain scenario if the peer link 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
A practitioner preparing for the 350-601 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
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.
Network — This question tests Network — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The vPC domain will continue to operate but with reduced reliability. — The vPC keepalive link is used as a secondary heartbeat to detect dual-active scenarios when the peer link fails. A consistency check failure on the keepalive link does not directly affect data forwarding; the vPC domain continues to operate, but the loss of this redundancy mechanism reduces reliability because the switches can no longer reliably detect a split-brain condition without the peer link.
What should I do if I get this 350-601 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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