The correct action is to configure port speed manually on the switch interface. This resolves the "FC interface offline due to speed mismatch" because the offline state in VSAN 100 typically indicates a Layer 1 or Layer 2 failure, often caused when the Fibre Channel initiator and switch port fail to negotiate a common speed. Manually setting the port speed forces the link to a specific rate, bypassing faulty auto-negotiation and bringing the interface online. On the Cisco DCCOR / CCNP Data Center Core 350-601 exam, this scenario tests your understanding of Fibre Channel interface states and troubleshooting Layer 1 issues—a common trap is assuming the problem is a zoning or fabric login error when the root cause is physical. Remember the memory tip: "Offline? Check the line—speed mismatch kills the link."
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.
A storage administrator reports that an FC initiator cannot log in to the SAN. The FC switch shows the following on the interface connected to the initiator: 'VSAN 100, State: Offline'. Which action should be taken to resolve the issue?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure port speed manually on the switch interface
The interface state 'Offline' in VSAN 100 indicates a Layer 1 or Layer 2 issue, often caused by a speed mismatch between the FC initiator and the switch interface. Configuring the port speed manually on the switch interface forces the link to negotiate at a specific speed, resolving the mismatch and bringing the interface online. This is a common fix when auto-negotiation fails or the initiator does not support the default speed settings.
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.
✗
Create a zone including the initiator and target
Why it's wrong here
Zoning does not affect link state; it controls device visibility.
✗
Change the interface VSAN to match the initiator
Why it's wrong here
The interface is already in VSAN 100 as shown by the state.
✗
Increase the number of buffer credits on the interface
Why it's wrong here
Buffer credits are not configured per port; they are negotiated between ports.
✓
Configure port speed manually on the switch interface
Why this is correct
Forcing the port speed can stop flapping and bring the link online.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between link-level issues (offline state) and fabric-level issues (zoning, VSAN membership), leading candidates to incorrectly choose zoning or VSAN changes when the root cause is a physical or speed mismatch.
Trap categories for this question
Command / output trap
The interface is already in VSAN 100 as shown by the state.
Detailed technical explanation
How to think about this question
FC interfaces use auto-negotiation to determine speed (e.g., 1/2/4/8/16/32 Gbps) and link parameters; if the initiator and switch fail to agree, the interface remains offline. Manually setting the port speed (e.g., via 'speed 8000' for 8 Gbps) forces a common speed, allowing the link to come up. In real-world scenarios, this is common when connecting older HBAs to newer switches or when cable issues cause negotiation failures.
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: Configure port speed manually on the switch interface — The interface state 'Offline' in VSAN 100 indicates a Layer 1 or Layer 2 issue, often caused by a speed mismatch between the FC initiator and the switch interface. Configuring the port speed manually on the switch interface forces the link to negotiate at a specific speed, resolving the mismatch and bringing the interface online. This is a common fix when auto-negotiation fails or the initiator does not support the default speed settings.
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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