Cisco Updated 350-601 Exam Questions and Answers by martina

The correct answer is D. file.

The NFSv4 (Network File System version 4) protocol is a file-level storage protocol, meaning it provides access to shared storage at the file system level rather than at the raw disk (block) level. In this model, clients interact with files and directories directly, using standard file operations such as open, read, write, and close. This aligns with the concept of NAS (Network Attached Storage), which NFS is a core part of in Cisco data center architectures.

Unlike block storage protocols such as iSCSI or Fibre Channel, which present storage as raw disk volumes that require a local file system to be created, NFS abstracts this complexity and allows multiple clients to access shared files concurrently. NFSv4 also introduces enhancements such as stateful operations, security improvements, and better locking mechanisms, making it suitable for enterprise environments.

Options A (block) and B (object) refer to different storage models, while C (inode) is an internal file system structure, not an access level. Therefore, NFSv4 operates at the file level, making D the correct answer.