CompTIA Network+ Practice Test

What distinguishes a Storage Area Network (SAN) from a NAS?

1. SAN provides block-level access and is more efficient

2. SAN requires less bandwidth

3. NAS is limited to only local storage

4. SAN does not allow file-level access

The correct answer is: SAN provides block-level access and is more efficient

A Storage Area Network (SAN) is distinguished from Network-Attached Storage (NAS) primarily because it provides block-level access to data, which enhances efficiency and performance for storage tasks. With a SAN, data is managed at a block level, allowing applications and servers to treat storage as if it were local, streamlining operations and improving speed for I/O-intensive tasks. This is particularly beneficial in environments requiring fast data throughput, such as database management systems or virtualized servers. In contrast, NAS typically offers file-level access, which in many cases may introduce additional overhead and potential bottlenecks because file-based protocols rely on an intermediary layer between the storage and the requesting device. While NAS is excellent for shared file storage and simpler access methods, SAN is designed for high-performance storage needs. The other options present misunderstandings about the capabilities and configurations of SAN and NAS. For example, SAN requiring less bandwidth isn't accurate as SAN often operates in high-end environments with dedicated, high-bandwidth connections to handle large volumes of data. Additionally, NAS is not limited to local storage; it can be accessed over a network, allowing distributed access. Lastly, while it's true that SAN doesn’t allow file-level access, the crucial distinction lies in how it optimally serves