The correct answer is that duplicate WWPNs exist in the fabric, causing device login conflicts. When a new storage array uses WWPNs previously assigned to decommissioned servers, the fabric name server becomes confused because two distinct devices claim the same 64-bit identifier. This leads to inconsistent LUN visibility, as the Fibre Channel switch may direct traffic to the wrong endpoint or reject logins entirely. On the Cisco DCCOR 350-601 exam, this scenario tests your understanding of Fibre Channel fabric fundamentals, specifically how the fabric resolves device logins via FLOGI and the name server database. A common trap is to blame zoning or NPV, but zoning only controls which devices can communicate—it does not resolve identity conflicts. Remember the memory tip: one WWPN, one device; two devices, zero stability.
350-601 Storage Network Practice Question
This 350-601 practice question tests your understanding of storage 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.
During a SAN migration, an engineer connects new storage to an existing MDS switch. The new storage array is configured with WWPNs that were previously used by decommissioned servers. After zoning is updated, some servers fail to see the correct LUNs. 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
✓
Duplicate WWPNs exist in the fabric, causing device login conflicts.
Duplicate WWPNs cause confusion in the fabric. Option A is correct. Option B is wrong because zoning was updated. Option C is wrong because NPV does not cause LUN issues. Option D is wrong because FLOGI would fail if there was a conflict.
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 NPV feature is enabled on the switch causing proxy login issues.
Why it's wrong here
NPV does not affect LUN visibility directly.
✓
Duplicate WWPNs exist in the fabric, causing device login conflicts.
Why this is correct
Reusing WWPNs without clearing the old entries leads to duplicate registrations.
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.
✗
The new storage is not in the same VSAN as the servers.
Why it's wrong here
Zoning was updated, so VSAN membership should be correct.
✗
The switch is running an older firmware that does not support the new storage.
Why it's wrong here
Firmware compatibility may cause issues, but WWPN duplication is more likely.
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.
Storage Network — This question tests Storage Network — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Duplicate WWPNs exist in the fabric, causing device login conflicts. — Duplicate WWPNs cause confusion in the fabric. Option A is correct. Option B is wrong because zoning was updated. Option C is wrong because NPV does not cause LUN issues. Option D is wrong because FLOGI would fail if there was a conflict.
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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