The answer is to assign a different domain ID to one of the switches. This is the best action because the error message indicates a domain ID conflict within the same VSAN, where two switches are attempting to claim the same unique identifier. In Fibre Channel fabrics, each switch must have a unique domain ID to build a correct forwarding table and prevent traffic blackholing; assigning a different ID to one switch resolves the conflict without disrupting the fabric. On the Cisco DCCOR 350-601 exam, this scenario tests your understanding of Fibre Channel principal switch selection and domain management, often appearing as a troubleshooting question where the trap is to reboot the switch or change the VSAN. Remember the key rule: every switch in a VSAN needs its own domain ID, just like every house on a street needs its own number—if two switches share one, the fabric cannot route frames correctly.
350-601 Storage Network Practice Question
This 350-601 practice question tests your understanding of storage 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.
Exhibit
Refer to the exhibit.
<error>
2023-01-15 10:23:45 FCSWITCH %FABRIC-3-DOMAIN_ID_CONFLICT: Domain ID 0x64(100) is already in use by switch wwn 10:00:00:00:c9:aa:bb:cc
</error>
Refer to the exhibit. An engineer sees this error on a Cisco MDS switch. What is the best action to resolve the issue?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Refer to the exhibit.
<error>
2023-01-15 10:23:45 FCSWITCH %FABRIC-3-DOMAIN_ID_CONFLICT: Domain ID 0x64(100) is already in use by switch wwn 10:00:00:00:c9:aa:bb:cc
</error>
A
Reload both switches to reset domain IDs.
Why wrong: Reloading may cause temporary resolution but the conflict may recur upon re-joining.
B
Shut and no shut the ISL between the switches.
Why wrong: This may cause a brief disruption but does not resolve the root cause.
C
Assign a different domain ID to one of the switches.
Each switch in a fabric must have a unique domain ID.
D
Change the VSAN on one of the switches.
Why wrong: Changing VSAN may change the domain ID but is not the standard solution.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Assign a different domain ID to one of the switches.
The error indicates a domain ID conflict between two switches in the same VSAN. In Fibre Channel fabrics, each switch must have a unique domain ID to build a correct forwarding table. Assigning a different domain ID to one of the switches resolves the conflict without disrupting the fabric.
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.
✗
Reload both switches to reset domain IDs.
Why it's wrong here
Reloading may cause temporary resolution but the conflict may recur upon re-joining.
✗
Shut and no shut the ISL between the switches.
Why it's wrong here
This may cause a brief disruption but does not resolve the root cause.
✓
Assign a different domain ID to one of the switches.
Why this is correct
Each switch in a fabric must have a unique domain ID.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Change the VSAN on one of the switches.
Why it's wrong here
Changing VSAN may change the domain ID but is not the standard solution.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that a link flap or reboot will fix a domain ID conflict, when in fact the root cause is a duplicate domain ID that must be manually changed on one switch.
Detailed technical explanation
How to think about this question
In Fibre Channel, domain IDs are assigned via the Principal Switch selection process using the Domain Manager protocol. If two switches claim the same domain ID, the fabric rejects the second switch's request, causing the error shown. A best practice is to configure static domain IDs in the range of 1–239 (avoiding 0xFF for broadcast) to prevent conflicts, especially in large fabrics where dynamic assignment may lead to collisions.
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.
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: Assign a different domain ID to one of the switches. — The error indicates a domain ID conflict between two switches in the same VSAN. In Fibre Channel fabrics, each switch must have a unique domain ID to build a correct forwarding table. Assigning a different domain ID to one of the switches resolves the conflict without disrupting the fabric.
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.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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