||A Network Access Server (NAS) is a single point of access to a remote resource.
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.
The 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.
The NAS contains no information about what clients can connect or what credentials are valid. All the NAS does is send the credentials the client supplied to a resource which does know how to process the credentials.
||NTFS is the standard file system of Windows NT, including its later versions Windows 2000, Windows XP, Windows Server 2003, Windows Server 2008, Windows Vista, and Windows 7