NFS stands for Network File System: a network file system protocol allowing a user on a client computer to access files over a network in a manner similar to how local storage is accessed. NFS works over the IP network so it communicates via Ethernet. Computers accessing NFS storage will communicate via their NIC (network interface card).
DFS stands for Distributed File System: In general terms, is any file system that allows access to files from multiple hosts sharing via a computer network. This makes it possible for multiple users on multiple machines to share files and storage resources. NFS is considered one of many different types of NFS. So DFS is more of a generic term.
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