AS & A Level Computer Science (9618) — October–November 2024, Paper 32

11 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.

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Question 1 · 7 marks · Communication - packet switching

Describe how packet switching is used to transmit messages across a network.

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Question 2 · 3 marks · File organisation - serial files

Describe serial file organisation as a method of storing data records in a file.

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Question 3 · 7 marks · Data types - user-defined record type

Describe the user-defined data type record.

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Question 4 · 6 marks · Data representation - floating-point to denary

Calculate the denary value of the given normalised binary floating-point number. Show your working. Mantissa: 0 1 0 0 0 1 1 1 0 1 1 1 Exponent: 0 1 1 1

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Question 5 · 7 marks · Networking - TCP/IP Application Layer protocols

Name and describe two protocols used by the Application Layer of the TCP/IP protocol suite. Protocol 1 ............ Description ............ Protocol 2 ............ Description…

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Question 6 · 9 marks · Boolean algebra - sum-of-products from a truth table

Write the Boolean logic expression that corresponds to the given truth table as the sum-of-products. X = ............ (A bar over a variable denotes NOT; a dot denotes AND; a plus…

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Question 7 · 9 marks · Syntax diagrams - validity

State why each number is invalid for the given syntax diagrams. 21 Reason ............ 123 Reason ............

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Question 8 · 4 marks · Processor architectures - CISC

Complex Instruction Set Computer (CISC) is a type of processor. Identify four features of a CISC processor. 1 ............ 2 ............ 3 ............ 4 ............

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Question 9 · 5 marks · Operating systems - kernel and interrupt handling

The kernel is the central component of an Operating System (OS). Outline how the kernel of an OS acts as an interrupt handler.

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Question 10 · 6 marks · Object-oriented programming - structure of a class

Objects and classes form the basic structure of Object-Oriented Programming (OOP). Outline the structure of a class.

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Question 11 · 12 marks · Data structures - binary tree as a linked list of nodes

A linked list of nodes is used to store the data. Each node consists of a left pointer, the data and a right pointer. −1 is used to represent a null pointer. Complete this linked…

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