SK0-004 · Question #858
A server technician is reviewing a list of WWNs within a SAN storage array before provisioning additional LUNs to VMs. The purpose is to ensure only specific HBAs will have access to a particular…
The correct answer is C. LUN masking. LUN masking controls which specific HBAs (identified by WWN) are permitted to access a given LUN on a SAN array. Reviewing WWNs before provisioning LUNs to restrict access is the definition of implementing LUN masking.
Question
A server technician is reviewing a list of WWNs within a SAN storage array before provisioning additional LUNs to VMs. The purpose is to ensure only specific HBAs will have access to a particular LUN. Which of the following BEST describes the technician's purpose?
Options
- ADirect access bridging
- BLUN zoning
- CLUN masking
- DNIC teaming
How the community answered
(19 responses)- A5% (1)
- C95% (18)
Why each option
LUN masking controls which specific HBAs (identified by WWN) are permitted to access a given LUN on a SAN array. Reviewing WWNs before provisioning LUNs to restrict access is the definition of implementing LUN masking.
Direct access bridging is not a standard SAN access control term and does not describe any process of restricting LUN visibility to specific HBAs via WWNs.
LUN zoning (more commonly called Fibre Channel zoning) is performed at the switch level to segment which HBAs can communicate, but it does not control access to specific LUNs at the array level the way masking does.
LUN masking is a storage array-level access control mechanism that uses WWNs to create an allowlist of HBAs permitted to see and access a specific LUN. The technician is reviewing WWNs precisely to configure this restriction, ensuring that only authorized hosts can mount and use the provisioned storage, which is the exact function LUN masking provides.
NIC teaming is a network interface aggregation technique for redundancy and throughput on Ethernet networks and has no relevance to SAN storage LUN access control or WWN management.
Concept tested: LUN masking using WWNs for SAN access control
Source: https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.storage.doc/GUID-1B27D5A3-9A33-4659-B2B5-7B1B5A5D5D5D.html
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