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Which is not a application layer protocol?

Which is not a application layer protocol?

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Which is not a application layer protocol?

 Options:

A. HTTP
B. SMTP
C. FTP
D. TCP

The Correct Answer Is:

  • D. TCP

The Transmission Control Protocol is known as TCP. A transport layer protocol facilitates packet transmission from source to destination. The protocol is connection-oriented, which means it establishes a connection between computing devices before a communication occurs between them. This protocol is used with an IP protocol, so together, they are referred to as a TCP/IP.

The main function of TCP is to receive data from the application layer. It then divides the data into several packets, assigns numbers to these packets, and finally sends the packets to the destination. While the TCP reassembles the packets and transmits them to the application layer, the Internet Protocol is responsible for reassembling the packets. Due to the fact that TCP is a connection-oriented protocol, the connection will remain established until the communication between the sender and receiver is completed.

Answer Explanation for Question ” Which is not a application layer protocol?”

Application Layer Protocols

Communication between different application processes (clients and servers) is defined by application layer protocols. TCP/IP and OSI share protocols are handled by application layers, which are abstract layers. In OSI and TCP/IP models, the application layer is the topmost layer. As a result of combining the application layer, presentation layer, and session layer in the TCP/IP model, the application layer is created.

Application layers define communication protocols and interface methods shared by network hosts. A software application is accessed directly by the end user through the application layer, which in turn can be accessed directly by the application layer as well. In the Application Layer, there are several protocols that work for users.

Some of the major types of application layer protocols are as follows:

  • Simple Mail Transfer Protocol (SMTP)

Electronic mail (e-mail) is a popular application layer protocol for network services. The Simple Mail Transfer Protocol (SMTP) is a TCP/IP protocol that supports electronic mail over the Internet. TCP connections are used to send messages from senders’ mail servers to recipients’ mail servers. An e-mail address is used to identify users in SMTP. Mail can be exchanged between computers using SMTP.

  • File Transfer Protocol (FTP)

Among the most widely used protocols for file transfers over networks is the File Transfer Protocol (FTP). The FTP protocol uses TCP/IP for communication, and port 21 is used for FTP. The FTP protocol works on a Client-Server model, where clients request files from servers and servers return requested resources.

In FTP, the control information is exchanged over TCP port 20, while the actual data is exchanged over TCP port 21. A file is requested by the client from the server. In response to a request for a file, the server opens a TCP connection and transfers the file to the client. A connection is closed by the server after the transfer has been completed. When the client requests a second file, the server opens a new TCP connection.

  • Hypertext Transfer Protocol(HTTP)

World Wide Web (www) data is accessed using Hypertext Transfer Protocol (HTTP). Despite the fact that modern browsers are able to access other types of servers, HTTP is the principal application-layer protocol of the Web. An interconnected repository of information spread throughout the world.

It allows the transfer of plain text, hypertext, audio, and video data. Client requests and server replies are sent over TCP connections via HTTP. In this protocol, persistent and non-persistent connections are made in a synchronous manner.

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