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OCR GCSE Computer Science

Study Notes
1.1.1 The Purpose of the CPU
1.1.2 The Fetch-Execute Cycle
1.1.3 Common CPU Components
1.1.4 Von Neumann Architecture
1.2.1 Clock Speed
1.2.2 Cache Size
1.2.3 Number of Cores
1.3.1 Purpose and Characteristics of Embedded Systems
1.3.2 Examples of Embedded Systems
2.1.1 The Need for Primary Storage
2.1.2 Difference Between RAM and ROM
2.1.3 Purpose of ROM
2.1.4 Purpose of RAM
2.1.5 Virtual Memory
2.2.1 The Need for Secondary Storage
2.2.2 Common Types of Storage
2.2.3 Suitable Storage Devices and Media
2.2.4 Advantages and Disadvantages of Storage Devices
2.3.1 Units of Data Storage
2.3.2 Binary Data Format
2.3.3 Data Capacity and Calculations
2.4.1 Conversions Between Denary, Binary, and Hexadecimal
2.4.2 Binary Arithmetic and Shifts
2.4.3 Character Encoding
2.4.4 Image Data Representation
2.4.5 Sound Data Representation
2.5.1 The Need for Compression
2.5.2 Types of Compression
2.5.3 Effects of Compression on Files
3.1.1 Types of Networks
3.1.2 Network Performance Factors
3.1.3 Network Hardware
3.1.4 The Internet and DNS
3.1.5 Network Services
3.1.6 Network Topologies
3.1.7 Application of Network Knowledge
3.2.1 Modes of Connection
3.2.2 Encryption and Security
3.2.3 IP and MAC Addressing
3.2.4 Standards and Protocols
3.2.5 The Concept of Layers
4.1.1 Malware
4.1.2 Social Engineering
4.1.3 Brute-force Attacks
4.1.4 Denial of Service Attacks
4.1.5 Data Interception and Theft
4.1.6 SQL Injection
4.2.1 Penetration Testing
4.2.2 Anti-malware Software
4.2.3 Firewalls
4.2.4 User Access Levels
4.2.5 Passwords
4.2.6 Encryption
4.2.7 Physical Security
5.1.1 Purpose and Functionality of Operating Systems
5.1.2 User Interface
5.1.3 Memory Management and Multitasking
5.1.4 Peripheral Management and Drivers
5.1.5 User Management
5.1.6 File Management
5.2.1 Purpose and Functionality of Utility Software
5.2.2 Encryption Software
5.2.3 Defragmentation
5.2.4 Data Compression Software
6.1.1 Impacts of Digital Technology on Society
6.1.2 Legislation Relevant to Computer Science
6.1.3 Software Licensing
7.1.1 Principles of Computational Thinking
7.1.2 Abstraction
7.1.3 Decomposition
7.1.4 Algorithmic Thinking
7.2.1 Identifying Inputs, Processes, and Outputs
7.2.2 Using Structure Diagrams
7.2.3 Algorithm Development Techniques
7.2.4 Error Identification and Trace Tables
7.2.5 Flowchart Symbols and Usage
7.3.1 Standard Searching Algorithms
7.3.2 Standard Sorting Algorithms
7.3.3 Applying Algorithms
7.3.4 Algorithm Identification
8.1.1 Basics of Programming
8.1.2 Programming Constructs
8.1.3 Arithmetic and Boolean Operators
8.1.4 Practical Application of Programming Techniques
8.2.1 Introduction to Data Types
8.2.2 Practical Use of Data Types
8.2.3 Choosing Suitable Data Types
8.2.4 Casting Between Data Types
8.3.1 Basic String Manipulation
8.3.2 Basic File Handling Operations
8.3.3 Use of Records to Store Data
8.3.4 Using SQL for Data Search
8.3.5 Arrays and Their Applications
8.3.6 Subprograms: Functions and Procedures
8.3.7 Random Number Generation
9.1.1 Defensive Design Considerations
9.1.2 Input Validation
9.1.3 Maintainability Techniques
9.1.4 Applying Defensive Programming
9.2.1 The Purpose of Testing
9.2.2 Types of Testing
9.2.3 Identifying Syntax and Logic Errors
9.2.4 Selecting and Using Test Data
9.2.5 Refining Algorithms
10.1.1 Simple Logic Diagrams
10.1.2 Truth Tables
10.1.3 Combining Boolean Operators
10.1.4 Applying Logical Operators to Solve Problems
11.1.1 High-level vs Low-level Languages
11.1.2 Purpose of Translators
11.1.3 Compilers vs Interpreters
11.2.1 Common Tools in an IDE
11.2.2 Editors
11.2.3 Error Diagnostics
11.2.4 Run-time Environment
11.2.5 Translators
11.2.6 Practical Experience with IDE Tools
12.1.1 Designing Software
12.1.2 Writing Code
12.1.3 Testing Software
12.1.4 Refining and Debugging
12.2.1 Choosing a Programming Language
12.2.2 Using Multiple Languages

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