NAS: How does a client access files?

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A NAS device is really a remote file system that can be communicated with using a protocol such as NFS or CIFS. A local file access is "redirected" to the remote file system (NAS) by using the access protocol, TCP (sometimes UDP) and IP over Ethernet.

The client that is accessing the NAS has to mount the remote file system or establish a share. The file structures in the mounted file system will then be used like a local file system.

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How to establish NAS checkpoints for NFS and CIFS systems?