CompTIA CASP+ Practice Test

Which of the following best describes LUN masking?

1. Controlling access to specific LUNs within a SAN

2. A method of improving storage performance

3. Automatically balancing load across multiple storage devices

4. Encrypting data at rest in the SAN

The correct answer is: Controlling access to specific LUNs within a SAN

LUN masking is primarily focused on controlling access to specific Logical Unit Numbers (LUNs) within a Storage Area Network (SAN). This technique ensures that only authorized hosts have the permissions to access particular LUNs, providing a layer of security and resource management. By applying LUN masking, administrators can prevent unauthorized access and enhance storage management by clearly delineating which servers or devices can see and interact with specific LUNs. The other options, while related to storage management and performance, do not accurately define the concept of LUN masking. For instance, improving storage performance typically relates to caching mechanisms or tiered storage approaches, which are not directly relevant to the access-control aspect of LUN masking. Load balancing across multiple devices involves distributing workloads to optimize performance and resource utilization but does not deal with access control. Finally, encrypting data at rest pertains to data security but does not focus on access management to LUNs. Therefore, the distinction made by LUN masking is crucial for maintaining operational integrity and security within a SAN environment.