350-601 Storage Network Practice Question
A company is consolidating its storage network into a single fabric using a Cisco MDS 9509. They want to use VSANs to isolate different departments. The VSANs will be 10, 20, and 30. They have a single ISL between two MDS switches. The engineers want to carry all three VSANs over the ISL. They configure both ends of the ISL as E ports and enable trunking. After configuration, they notice that only VSAN 10 traffic passes over the ISL. The other VSANs appear isolated. The show vsan membership shows all three VSANs are present on both switches. The show interface trunk on the ISL shows that the trunk is up but only VSAN 10 is allowed. What is the most likely cause?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The allowed VSAN list on the trunk port is limited to only VSAN 10
The show interface trunk output indicates that only VSAN 10 is in the allowed list. The allowed VSAN list on the trunk port must be configured to include all three VSANs. The trunk mode (on/desirable) does not limit VSANs. Error-disabled would show in different status. VSAN membership on the interface is not applicable for trunk ports.
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 other VSANs are not configured on the trunk interface
Why it's wrong here
VSANs are configured switch-wide, not per interface.
- ✓
The allowed VSAN list on the trunk port is limited to only VSAN 10
Why this is correct
The allowed VSAN list must be explicitly configured to include VSAN 20 and 30.
- ✗
The trunk mode is set to 'on' instead of 'desirable'/'auto'
Why it's wrong here
Trunk mode 'on' enables trunking but does not restrict allowed VSANs.
- ✗
The ISL is in an error-disabled state for VSAN 20 and 30
Why it's wrong here
Error-disable would prevent traffic on those VSANs, but the trunk status shows only VSAN allowed.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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