- National Academy of Sciences
- naval air station
nas - Computer Definition
- Network Access Server. A host computer on a local area network (LAN) dedicated to serve the needs of end users seeking access to internal computer resources or perhaps to the Internet through an Internet service provider (ISP). An NAS generally is associated with a Remote Authentication Dial-In User Service (RADIUS) server that performs authentication and accounting functions to ensure network security. See also authentication, ISP, LAN, RADIUS, RAS, and security.
- Network-Attached Storage. A simple storage technology in which one or more disk arrays or other storage devices are associated with a server that exists as a node on a LAN.The storage server assumes the responsibility for all data storage and for making the data available to all users with access privileges. A storage area network (SAN) is a much more sophisticated approach. See also LAN, node, SAN, and server.
(1) See network access server.
(2) (Network Attached Storage) A file server that connects to the network. A NAS contains the file sharing components of a server and generally does not run applications like a general-purpose computer. However, it is often designed to run NAS-related programs such as backup, cloud synchronization, streaming, surveillance and other services. NAS units generally contain a slimmed-down OS and file system, and they process I/O requests by supporting the popular file sharing protocols, primarily CIFS for Windows and NFS for Unix, Linux and Mac. Just Plug It In Using traditional LAN protocols such as TCP/IP over Ethernet, the NAS enables more storage to be quickly added to the network by plugging it into a switch or router. Contrast with SAN. See NAS gateway, direct attached storage and NetApp Filer.