Which of the following is correct about the advantages brought by enterprises using SAN storage instead of NAS storage? (Multiple choice)

Question

Options

• ABetter scalability, which facilitates subsequent business expansion
• BCentralized network file access mechanism and sharing to solve independent working
• CStorage uses block data processing to improve read and write efficiency
• DBuilt-in optimized independent storage operating system (this is the advantage of NAS)

• A
  71% (41)
• B
  10% (6)
• D
  19% (11)

Explanation

SAN (Storage Area Network) delivers block-level data access rather than file-level, meaning applications read/write raw blocks directly to storage-eliminating file-system overhead and boosting I/O performance, which is why C is correct. SANs also use a dedicated high-speed fabric (Fibre Channel or iSCSI) that allows storage capacity to be added independently of servers, making expansion straightforward-which is why A is correct.

B is wrong because centralized network file sharing (via NFS/SMB protocols) is the defining advantage of NAS, not SAN. SAN exposes raw block devices, not shared file systems. D is wrong because a purpose-built storage OS (like those in NAS appliances) is an advantage of NAS, not SAN-the question itself even hints at this.

Memory tip: Think of SAN as "Storage Attached like a Native disk"-it acts like a local hard drive over a network (block-level, fast, scalable), while NAS is "Network file-Access Sharing"-it's a shared folder on the network (file-level, easy sharing, built-in OS).

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