A-LevelComputer ScienceCommunication and internet technologies9618/32 · May/June 2025 · Q35 Marks

Identify two different layers of the TCP/IP protocol suite.

(a)Identify two different layers of the TCP/IP protocol suite.[1]
(b)Describe how the TCP/IP protocol suite is applied when a message is sent through the internet from one host to another. Do not describe the function of individual layers of the TCP/IP protocol suite.[4]

Mark scheme

Marking points from the official mark scheme (May/June 2025). The mark or mark type is shown in brackets.

Application Layer
Transport Layer
Internet Layer
Link Layer
MP1 The TCP/IP suite can be viewed as layers within a stack
MP2 Each layer can only accept input from the next higher or the next lower layer/adjacent layer
MP3 The user/sender/computer interfaces with the top layer/application layer to send/receive a message
MP4 The message when sent passes from the top layer/application layer to the bottom layer/link layer
MP5 The message when received passes from bottom layer/link layer to the top layer/application layer
MP6 The link layer interfaces directly with the network and sends/receives the message.

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Topic: Communication and internet technologies, A-Level Computer Science (syllabus 9618). Structured question, 5 marks.
Source: A-Level Computer Science, May/June 2025 Paper 3 Variant 2, question 3.

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