Outline the functions of the Transport and Internet layers of the TCP/IP protocol suite. Transport layer Internet layer

Mark scheme

Marking points from the official mark scheme (Oct/Nov 2022). The mark or mark type is shown in brackets.

1. [5] One mark for each point (Max 3 for Transport Layer, Max 3 for Internet Layer, total Max 5); Transport Layer: MP1 The Transport Layer breaks data into manageable packets / performs segmentation; MP2 It sequences the packets // adds data to the packet header // adds a packet header; MP3 It sends the packets to the Internet / Network Layer // It receives data from the Application Layer; MP4 It controls the flow of packets; MP5 It handles packet loss/corruption // Acknowledges receipt of complete error free packets; Internet Layer: MP6 The Internet Layer identifies the intended network and host; MP7 It transmits packets to the (Data) Link / Physical Layer; MP8 It routes the packets independently through the optimum route; MP9 It addresses packets with their source and destination IP addresses; MP10 It then uses an IP address and port number to form a socket.