S. NO    Parameter               NFSv3             NFSv4
1 State NFSv3  is a Stateless protocol NFSv4 is a Stateful protocol
2 Export Mounting In NFSv3 all exports are mounted separately. In NFSv4 all exports are mounted together as a part of pseudo-file system.
3 Protocols In NFSv3 there are numerous protocols for different operations are collected together such as MOUNT, STATUS .. NFSv4 comes with a single protocol with addition of OPEN and CLOSE for security auditing.  
4 No of operation / Per RPC call One operation per RPC ( Remote Procedure Call). Multiple operation per RPC ( Remote Procedure Call)
5 Delegation No support of Delegation Support for Delegation
6 POSIX support Only POSIX support Implementation of ACLs