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Network File System (NFS) has been part of the world of free operating systems and proprietary UNIX flavors since the mid-1980s. But not all administrators know how it works or why there have been new releases. It is important to know about NFS simply because the system is vital seamless access across UNIX networks. Learn how the latest release of NFS, NFSv4, has addressed many criticisms, particularly with regard to security problems, that became apparent in versions 2 and 3.