CompTIA
CAS-002 · Question #84
CAS-002 Question #84: Real Exam Question with Answer & Explanation
The correct answer is A: LUN masking. LUN masking is the storage access control mechanism that selectively presents or hides specific logical unit numbers to designated hosts in a SAN environment.
Question
A storage administrator would like to make storage available to some hosts and unavailable to other hosts. Which of the following would be used?
Options
- ALUN masking
- BDeduplication
- CMultipathing
- DSnapshots
Explanation
LUN masking is the storage access control mechanism that selectively presents or hides specific logical unit numbers to designated hosts in a SAN environment.
Common mistakes.
- B. Deduplication removes redundant data blocks to reduce consumed capacity and has no role in controlling which hosts can access which storage volumes.
- C. Multipathing establishes multiple redundant I/O paths between a host and storage array to improve availability and throughput, not to restrict or grant access.
- D. Snapshots create point-in-time copies of data for backup and recovery purposes and do not control host-to-LUN access permissions.
Concept tested. SAN LUN masking for host-level storage access control
Reference. https://www.snia.org/sites/default/files/technical_work/PracticeDirective/SNIA-PD-LUNMasking-1.0.pdf
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