CREST Practitioner Security Analyst (CPSA) Practice

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FTP operates primarily over which type of protocol layer?

Application layer
Transport layer
Network layer
Link layer

The correct answer is: Application layer

FTP, or File Transfer Protocol, operates primarily at the application layer of the Internet Protocol Suite. This layer is responsible for providing network services directly to end-user applications. FTP is specifically designed to allow users to transfer files over a network, and it offers a set of commands and responses that facilitate these file transfers. By functioning at the application layer, FTP can leverage lower layers (such as the transport layer, which includes protocols like TCP) to manage the actual communication between hosts, but its core functionalities and commands, such as uploading and downloading files, are defined at the application layer. This distinction is crucial in understanding how different layers of the protocol stack work together to enable various network services.