I've two NFS shares mounted on the OS & I also have one CIFS share. none of the above mounts in fstab file have soft or hard explicitly mentioned in their respective mount options.
So how can I find out if they are soft mounts or hard?
soft / hard Determines the recovery behavior of the NFS client after an NFS request times out. If neither option is specified (or if the hard option is specified), NFS requests are retried indefinitely. If the soft option is specified, then the NFS client fails an NFS request after retrans retransmissions have been sent, causing the NFS client to return an error to the calling application.
So the default unless specified otherwise for NFS is hard.
man mount.cifs says:
soft (default) The program accessing a file on the cifs mounted file system will not hang when the server crashes and will return errors to the user application.
And the default for CIFS is soft.