Which of the following is the main difference between NAS and DAS?

NAS (Network Attached Storage) is designed specifically to be shared amongst multiple computers over a network, making this statement incorrect.

DAS (Direct Attached Storage) can be configured with RAID for fault tolerance, so this statement does not highlight a main difference, as both NAS and DAS can offer fault tolerance.

DAS (Direct Attached Storage) connects directly to a single server, typically via interfaces like SAS, SATA, or USB, and therefore does not inherently use traditional network devices such as Ethernet switches or network protocols to access its storage. NAS (Network Attached Storage), conversely, is accessed over a standard IP network, requiring network interfaces and devices.

NAS typically does not use an HBA (Host Bus Adapter) in the traditional sense, as it connects via a standard network interface card (NIC); DAS, especially with Fibre Channel or SAS connectivity, often uses HBAs.