Which service is typically required to support RPC-based access for mounting NFS shares on a Red Hat 7 system?

• A. chronyd
• B. smbd
• C. rpcbind
• D. nfsd

Answer: (C)

RPC-based mounting relies on a port mapping service to locate the NFS-related RPC services on the server. rpcbind acts as the portmapper, registering and translating RPC program numbers (such as the mount service and the NFS service) into network ports. When a client mounts, it first queries rpcbind on the server to learn which port the MOUNT service is listening on, then uses that port for subsequent RPC calls to perform the mount and access operations. Without rpcbind, the client can’t discover where the NFS services live, so mounting fails even if the NFS server is running. The other options don’t provide this discovery mechanism: chronyd is for time synchronization, smbd is for Samba Windows shares, and nfsd is the actual NFS server daemon, not the port mapping service.