USEFULNESS OF RPC AND XDR
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NFS uses the RPC mechanism found in Unix to enforce a client-server relationship on the hosts that use it. RPC allows a host to make a procedure
call from a process that appears as if it is local but in fact is executed on a remote machine. Typically, the host on which the call is executed has
resources (such as files) needed by the calling host.
XDR (eXternal Data Representation) is a mechanism used by the RPC mechanism (and NFS) to ensure reliable data
exchange between hosts. XDR defines a machine independent format for the exchange of binary data.