The Network File System (NFS) allows which of the following functionalities?

The Network File System (NFS) is primarily designed to facilitate the sharing of files across a network, allowing users to access files on remote systems as if they were local. This functionality is executed through the mounting of remote file systems on local machines, enabling a seamless experience in accessing data irrespective of physical location.

When remote hosts mount file systems over a network, they can perform operations such as reading and writing files, which enhances collaboration and data sharing among different users and systems. This capability is what distinguishes NFS as a critical tool in distributed network environments.

Other functionalities listed in the question, such as sharing files directly between servers only or limiting the interaction to cloud storage, do not accurately represent the core functionalities of the NFS. NFS's primary strength lies in allowing remote connections and integrations rather than focusing solely on server-to-server interactions or cloud-based uploads. Additionally, while local file access speed improvements can be a result of caching and other optimizations in certain contexts, they are not a direct functionality offered by NFS itself, which is focused on network-based file system operations.