TCP/IP Application Layer Protocols

In this article we will discuss TCP/IP Application Layer Protocols, will make brief discussion on TCP/IP Application Layer Protocols, In last article we discuss about Presentation and Session Layer.

The TCP/IP application protocols specify the format and control information necessary for many common Internet communication functions. Click each application protocol in the figure to learn more about them.

TCP/IP Application Layer Protocols

Application layer protocols are used by both the source and destination devices during a communication session. For the communications to be successful the application layer protocols implemented on the source and destination host must be compatible.


Translates domain names, such as, into IP addresses


  • Enables a diskless workstation to discover its own IP address, the IP address of a BOOTP server on the network, and a file to be loaded into memory to boot the machine
  • BOOTP is being superseded by DHCP


Dynamic Host Configuration Protocol (DHCP) is a client/server protocol that automatically provides an Internet Protocol (IP) host with its IP address and other related configuration information such as the subnet mask and default gateway.


POP and SMTP. POP and SMTP are the two protocols which take care of the email flow (send and receive respectively) on the internet. SMTP (“Simple Mail Transfer Protocol”) is used for sending and delivering from a client to a server via port 25: it’s the outgoing server.


Hyper Text Transfer Protocol Secure (HTTPS) is the secure version of HTTP, the protocol over which data is sent between your browser and the website that you are connected to. The ‘S’ at the end of HTTPS stands for ‘Secure’. It means all communications between your browser and the website are encrypted.

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