You are troubleshooting the failure of a computer to mount an NFS file system hosted by a server (hostname mars) in the local area network. Select the three commands that will enable you to identify the problem.

To troubleshoot an NFS mount failure from a client, you must verify network connectivity, exported shares, and RPC services. ping -s mars verifies basic ICMP network reachability to the NFS server. showmount -e mars queries the server's mount daemon to display the file systems currently exported. rpcinfo -s mars | egrep 'nfs|mountd' verifies that the required NFS and mountd RPC services are registered and actively responding on the server. These three commands isolate network, configuration, and service-level issues.

B: /etc/vfstab lists file systems to be mounted at boot, but it does not actively test or identify server-side NFS failures. C: /etc/dfs/dfstab is deprecated in Solaris 11; NFS shares are managed via ZFS properties (sharenfs) or the share command. D: sharemgr is obsolete in Solaris 11, having been replaced by the zfs set sharenfs and share commands.

1. Oracle Corporation. "Oracle Solaris 11.1 Administration: Network Services." Part No: E28994. Chapter 5: Network File System Administration, Section: "Troubleshooting NFS Problems."

2. Oracle Corporation. "man pages section 1M: System Administration Commands." showmount(1M) and rpcinfo(1M) manual pages.