Which of the following statements about the evolution of storage network architecture is correct?

Question

Options

• AThe increase in data volume led to the demand for storage, which led to the earliest and simplest
• BSAN provides file storage, and its emergence solves the problem of inconvenient file sharing in DAS
• CCompared with DAS architecture, NAS architecture can provide better file sharing services
• DDistributed storage appeared at the same time as DAS, providing better scalability for DAS

• A
  6% (1)
• B
  13% (2)
• C
  75% (12)
• D
  6% (1)

Explanation

C is correct because NAS (Network Attached Storage) operates over a standard network and provides file-level access to multiple clients simultaneously, making it purpose-built for file sharing - something DAS (Direct Attached Storage) cannot do since it is physically tied to a single host.

A is wrong because while data growth did drive storage evolution, the statement misattributes the timeline - DAS was the first storage form not primarily because of volume demands, but because it was the simplest architecture (direct cable connection), predating networked storage concepts entirely.

B is wrong because SAN (Storage Area Network) provides block-level storage, not file-level storage - that distinction belongs to NAS. SAN was designed to improve performance and centralization for servers, not to solve file-sharing inconvenience.

D is wrong because distributed storage is a modern concept (emerging prominently in the 2000s with cloud-scale systems like HDFS and Ceph), appearing decades after DAS, not simultaneously with it.

Memory tip: Think of the acronyms by what they attach to - DAS = Direct (one machine), NAS = Network files (many users share), SAN = Server blocks (high-performance block I/O). The evolution goes DAS → NAS/SAN → Distributed, in that order.

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