Compaq N2400 - TaskSmart - 1 GB RAM Administration Manual page 154

4-4 Compaq TaskSmart N2400 Administration Guide
NFS Configurations
There are two versions of NFS, Version 2 and Version 3. Version 3 supports
additional file operations that Version 2 did not have, such as asynchronous
file operations.
NFS has the capacity to operate with two different network protocols:
Transport Control Protocol (TCP)
User Datagram Protocol (UDP)
Traditionally, NFS operates with UDP for performance purposes, but it can
also operate with TCP. This operating ability allows for four possible
combinations:
NFS Version 2 operating with UDP
NFS Version 2 operating with TCP
NFS Version 3 operating with UDP
NFS Version 3 operating with TCP