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Q141 (CISF/2019) Science & Technology › ICT, AI, Cybersecurity & Emerging Tech

In the context of computer networks, which one of the following is not an application layer protocol?

Explanation

In computer networking models (OSI and TCP/IP), protocols are organized into layers. The Application Layer is the layer that interacts directly with software applications like web browsers or email clients.

  • SMTP (Simple Mail Transfer Protocol): Used for electronic mail transmission (Application Layer).
  • FTP (File Transfer Protocol): Used for the transfer of computer files between a client and server (Application Layer).
  • HTTP (Hypertext Transfer Protocol): The foundation of data communication for the World Wide Web (Application Layer).
  • TCP (Transmission Control Protocol): This is a Transport Layer protocol. It provides reliable, ordered, and error-checked delivery of data between applications running on hosts communicating over an IP network.

Since TCP operates at the Transport Layer, it is not an application layer protocol.

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