Which two characteristics are most typical of a SAN? (Choose two.)

Question

Options

• ANICs are used for network connectivity.
• BServers request specific blocks of data.
• CStorage devices are directly connected to servers.
• DA fabric is used as the hardware for connecting servers to storage devices.
• EThe TCO is higher because of the cost of director class storage switches.

• A
  7% (4)
• B
  87% (48)
• C
  2% (1)
• E
  4% (2)

Explanation

B is correct: SANs use block-level storage protocols such as Fibre Channel or iSCSI. The server OS sees the storage as a local disk and issues requests for specific blocks (sectors) of data - not files (as NAS does). D is correct: The defining physical characteristic of a SAN is the Fibre Channel fabric - a dedicated network of switches (directors and edge switches) that interconnects servers (HBAs) and storage arrays. NICs are used in IP/Ethernet networks (NAS uses NICs); storage devices are not directly attached to servers in a SAN (that would be DAS); and higher TCO is a debatable generalization, not a defining characteristic.

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