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Version 4 (RFC 3010, December 2000; revised in RFC 3530, April 2003 and again in RFC 7530, March 2015), influenced by [[Andrew File System]] (AFS) and [[Server Message Block]] (SMB, also termed CIFS), includes performance improvements, mandates strong security, and introduces a [[State (computer science)|stateful]] protocol.<ref>{{cite web|url=http://www.usenix.org/events/usenix05/tech/italks.html#nFSv4|title=NFS Version 4|date=2005-04-14|publisher=[[USENIX]]}}</ref><ref name="sane2000">{{cite web |url= http://www.sane.nl/events/sane2000/papers/pawlowski.pdf |title=The NFS Version 4 Protocol |year=2000 |publisher=[[System Administration and Network Engineering|SANE]] |author1=Brian Pawlowski |author2=Spencer Shepler |author3=Carl Beame |author4=Brent Callaghan |author5=Michael Eisler |author6=David Noveck |author7=David Robinson |author8=Robert Thurlow }}</ref> Version 4 became the first version developed with the [[Internet Engineering Task Force]] (IETF) after [[Sun Microsystems]] handed over the development of the NFS protocols.
NFS version 4.1 (RFC 5661, January 2010; revised in RFC 8881, August 2020) aims to provide protocol support to take advantage of clustered server deployments including the ability to provide scalable parallel access to files distributed among multiple servers (pNFS extension). Version 4.1 includes Session trunking mechanism (Also known as NFS Multipathing) and is available in some enterprise solutions as [[VMware ESXi]].
NFS version 4.2 (RFC 7862) was published in November 2016<ref>{{cite ietf
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