Which statement identifies the primary difference between NAS and DAS?

Which statement identifies the primary difference between NAS and DAS?

• A. NAS cannot be shared and accessed by the multiple computers.
• B. DAS provides fault tolerance
• C. DAS does not connect to networked storaged devices
• D. NAS uses an HBA and DAS does not

Answer: (C)

The main idea here is how storage is accessed: NAS is connected to a network and serves files to multiple clients, while DAS is directly attached to a single host and isn’t designed for network sharing. The statement that best captures the difference is that DAS does not connect to networked storage devices. Because DAS sits directly on a host, it isn’t accessed over the network in the way NAS storage is; NAS provides networked file access to many machines, whereas DAS is meant for a single system’s storage needs. The other ideas don’t fit as the primary distinction. NAS can be shared by multiple computers, so the claim that it cannot is incorrect. Fault tolerance isn’t the defining difference—DAS can have redundancy, but that’s not what separates NAS from DAS. And while some say NAS uses a network interface while DAS doesn’t, both can involve networking in different contexts; the key point remains that NAS is network-based and DAS is directly attached to a single host.

The main idea here is how storage is accessed: NAS is connected to a network and serves files to multiple clients, while DAS is directly attached to a single host and isn’t designed for network sharing. The statement that best captures the difference is that DAS does not connect to networked storage devices. Because DAS sits directly on a host, it isn’t accessed over the network in the way NAS storage is; NAS provides networked file access to many machines, whereas DAS is meant for a single system’s storage needs.

The other ideas don’t fit as the primary distinction. NAS can be shared by multiple computers, so the claim that it cannot is incorrect. Fault tolerance isn’t the defining difference—DAS can have redundancy, but that’s not what separates NAS from DAS. And while some say NAS uses a network interface while DAS doesn’t, both can involve networking in different contexts; the key point remains that NAS is network-based and DAS is directly attached to a single host.