Discuss the improvements of NFS version 4 over NFS version 3.
What will be an ideal response?
NFS version 4 comes with several improvements compared to version 3. These include:
• The mount and lock protocol are now part of the NFS protocol, simplifying firewall rules for NFS. NFS uses TCP port 2049; UDP is no longer supported.
• Using Kerberos, it is possible to allow access on a per-user basis (version 3 was based only on IP addresses or DNS names).
• Encryption is part of the specification. While Secure-RPC allowed encryption with version 3, it was hardly ever used.
• Additional improvements concern the use of user@computername instead of numeric IDs to identify users, ACLs, and changes in the way files are locked.
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