350-601 Storage Network Practice Question
A new storage administrator is configuring LUN masking on a Cisco MDS switch. The storage array presents two LUNs to the fabric with the same LUN ID (0) but to different target ports. The administrator wants to ensure that a specific host can access both LUNs. The host is connected to a single HBA port. The host will see both target ports in the same zone. After zoning, the host discovers both target ports but only sees the first LUN. The show flogi database shows the host's pWWN with two FC IDs assigned. What is the most likely issue?
⚠ Common exam trap
Cisco often tests the distinction between zoning (fabric-level connectivity) and LUN masking (array-level access control), trapping candidates who assume zoning alone grants LUN visibility.
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 target LUNs are not masked to the host's pWWN
The host discovers both target ports via FLOGI but only sees the first LUN because the storage array has not been configured to mask the LUNs to the host's pWWN. LUN masking is an array-side access control that determines which initiator WWNs can see which LUNs; without it, the array defaults to presenting only the first LUN (LUN 0) to any initiator. The zone is correctly configured (both target ports are in the same zone and the host sees them), and the LUN ID conflict is irrelevant because the LUNs are on different target ports, so they can share the same LUN ID without conflict.
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 zone is misconfigured
Why it's wrong here
The host sees both target ports, so zoning is correct.
- ✗
The host is not configured for multipathing
Why it's wrong here
Multipathing affects path failover, not the ability to see LUNs.
- ✗
There is a LUN ID conflict
Why it's wrong here
Duplicate LUN IDs across different targets are allowed and handled by the host OS.
- ✓
The target LUNs are not masked to the host's pWWN
Why this is correct
The storage array likely has LUN masking that only allows the first LUN for this host.
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