Which linux file instructs linux about which folders to share with nfs?

The answer is : /etc/exports file. It is the Linux file that instructs Linux which folders to share with NFS and what NFS features should be enabled. It controls which file systems are exported to remote hosts and specifies options. It contains a table of local physical file systems on an NFS server that are accessible to NFS clients.

no backup memory

answeruse the nslookup utility;