IGCSE Computer Science Paper-1: Specimen Questions with Answers 120 - 120 of 164

Question 120


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Explain the various layer of TCP/IP model using a suitable diagram.


The TCP/IP Model is the concised version of the OSI model. The main layers of TCP/IP Model are:

Image of The TCP & IP

Image of the TCP & IP

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i) Application Layer: It is the topmost layer of the TCP/IP Model. This layer defines how data should be sent physically through the network. Some of the protocols used by this network are Ethernet, token ring, FDDI, X. 25, frame relay.

ii) Transport Layer: This layer is responsible for the reliability, flow control, and correction of data beings sent over the network. User Datagram protocol and Transmission control protocol are the two protocols used in the transport layer. UDP is responsible for providing connectionless service and end-to-end delivery of transmission. The TCP is responsible for providing a full transport layer services to applications. It also detects the error and retransmits the damaged frames.

iii) Internet Layer: The main task is to send the packets from any network, and they arrive at the destination irrespective of the route they take.

iv) Network interface Layer: The Network Interface layer is responsible for adding or removing any link layer protocol header which is required to deliver a message to the destination.

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