A server administrator implements external storage for a file server. At a later time, another administrator wants to extend this storage to a second server but is unable to connect to two servers…

DAS is directly attached to one host via interfaces such as SATA, SAS, or USB, giving only that single server access to the storage. Unlike networked storage solutions, DAS has no built-in sharing capability, so a second server cannot access the same DAS device without physically reconnecting or using additional intermediary hardware.

NAS (Network Attached Storage) is accessible over a standard IP network by multiple clients simultaneously, so it would not cause the described single-server limitation.

VSAN (Virtual Storage Area Network) is a virtualized shared storage solution that supports concurrent connections from multiple hosts across a network fabric.

SAN (Storage Area Network) is designed specifically to provide shared block-level storage to multiple servers at the same time over a dedicated storage network.