The answer is mismatched vPC consistency parameters between the peer switches, which causes packet drops during failover events. When a vPC member link goes down, the two Nexus 9000 switches must agree on critical Type-1 and Type-2 consistency parameters—such as STP settings, VLAN interfaces, and port-channel configurations—to maintain a unified forwarding state. If these parameters differ, the switches cannot synchronize their forwarding tables, leading to dropped traffic as the surviving peer lacks the correct information to forward packets for the orphaned VLANs or port channels. On the Cisco DCCOR 350-601 exam, this scenario tests your understanding of vPC failure isolation and the “consistency check” mechanism; a common trap is assuming peer-keepalive or role election alone prevents drops, but consistency mismatches are the silent culprit. Remember the memory tip: “If the parameters don’t match, the packets will catch.”
350-601 Network Practice Question
This 350-601 practice question tests your understanding of network. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 financial services company is migrating its core banking application to a new data center built on Cisco Nexus 9000 switches with VXLAN EVPN. The application requires active-active multihoming for its servers, which are dual-homed to two leaf switches. The network team has configured vPC on the leaf switches for the server connections. After the migration, the application team reports that some packets are being dropped during failover events when one of the vPC member links goes down. The network team confirms that vPC is properly configured and the peer-keepalive is functioning. What is the most likely cause of packet drops during failure?
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 vPC consistency parameters are not identical between the peer switches.
Option A is correct because vPC consistency parameters must match; if not, traffic may be dropped because the switches have different forwarding information. Option B is for gateway IP, not failover drops. Option C is for role election. Option D is for ports not in vPC.
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 consistency parameters are not identical between the peer switches.
Why this is correct
Mismatched parameters cause forwarding inconsistencies.
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 350-601 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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 consistency parameters are not identical between the peer switches. — Option A is correct because vPC consistency parameters must match; if not, traffic may be dropped because the switches have different forwarding information. Option B is for gateway IP, not failover drops. Option C is for role election. Option D is for ports not in vPC.
What should I do if I get this 350-601 question wrong?
Identify which 350-601 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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