A Network File System is any software and network protocols that support
the sharing of files by multiple users over a network. On
Unix systems, this is usually implemented using the NFS
protocol, which relies on UDP/IP.
On Windows NT systems, this is usually implemented
with the SMB protocol, which in turn can be implemented over
IPX, NetBEUI or TCP/IP.
On NetWare systems, this is usually implemented with the
NCPFS protocol, which in turn relies on IPX.