Network Attached Storage (NAS)

Network Attached Storage is a file-level computer data storage server connected to a computer network providing data access to a heterogeneous group of clients. NAS systems are networked appliances that contain one or more storage drives, often arranged into logical, redundant storage containers or RAID. A Network Attached Server concentrates dial-in and dial-out user communications. An access server may have a mixture of analog and digital interfaces and support hundreds of simultaneous users. A NAS consists of a communications processor that connects asynchronous devices to a LAN or WAN through network and terminal emulation software. It performs both synchronous and asynchronous routing of supported protocols. The NAS is meant to act as a gateway to guard access to a protected resource. This can be anything from a telephone network, to printers, to the Internet. A client connects to the NAS. The NAS then connects to another resource asking whether the client's supplied credentials are valid. Based on that answer the NAS then allows or disallows access to the protected resource.