Source: https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-3-3-network-performance [Revision notes](https://senecalearning.com/en-gb/revision-notes.md) › [GCSE](https://senecalearning.com/en-gb/revision-notes/gcse.md) › [Computer Science](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science.md) › [OCR](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr.md) › Network Performance # Network Performance Computer Science: OCR GCSE, topic 1.3.3 ## Network Performance There are many factors which affect the overall performance on a network: ### Bandwidth ![Bandwidth](https://image-v2.cdn.app.senecalearning.com/2018-07/0a18813c-bd29-4490-a4cf-2818a9d61ce0/Broadband-Bandwidth-Fibre-Optic-Cables-Computer-.jpg) - Bandwidth is the quantity of data that can be transferred in a set amount of time. - Higher bandwidths mean higher performance potential of the network. - If many devices share the same bandwidth, each device may get slower speeds. ### Wired vs wireless ![Wired vs wireless](https://image-v2.cdn.app.senecalearning.com/courseImages/physics/1.5.1%20Energy%20Changes/wires%20-%20Edited-min.jpg) - Wired networks are usually much faster and more reliable. - There is a greater chance of all of the packets of data arriving at their intended destination when using wired networks. There is very little interference with the signal. - Data packets being sent wirelessly are competing with other wireless signals, which increases the rate at which data will not arrive at its destination. - Wireless performance depends on how well a computer can pick up the signal, but is rarely better than a wired connection would be. ### Choice of hardware ![Choice of hardware](https://image-v2.cdn.app.senecalearning.com/courseImages/biology/1.1.2%20-%20Cell%20specialisation/cables-1080555_640-min.jpg) - Copper cables (Ethernet) use electrical signals. They are cheap but can suffer from interference and have a limited maximum speed. - Fibre optic cables use light signals, allowing very high speeds, long distances, and no electrical interference. - Network interface cards (NICs) affect performance depending on whether they support faster standards (e.g., 1 Gb/s vs 100 Mb/s). - Routers and switches must be powerful enough to handle the number of connected devices. Weaker devices create bottlenecks. ### Topology ![Topology](https://image-v2.cdn.app.senecalearning.com/courseImages/chemistry/2.3.3%20-%20Carbon%20structures/board-730797_640-min.jpg) - The topology of the network (how the computers are laid out and connected together) impacts the network performance. - Star topology often gives the best performance because each device has a direct connection to a central switch or server. - In a bus topology, all devices share one cable, so performance drops as more devices are added. - In a mesh topology, many routes exist, so data can travel more efficiently, improving reliability and speed. ## Network Performance (cont.) ### Number of users ![Number of users](https://image-v2.cdn.app.senecalearning.com/2024-03/bafedd8b-6b17-4722-9c04-82c3bbaf0f38/scott-graham-5fNmWej4tAA-unsplash.jpg) - Lots of devices using the network at the same time can overload it, reducing speed for everyone. - Heavy activities like video streaming or gaming can slow down other users. ### Distance and latency ![Distance and latency](https://image-v2.cdn.app.senecalearning.com/2018-07/ba0efdcb-4816-46d6-aa4f-bc6af0760e66/WAN-Wired-Area-Connection-City-Lights-Night-.jpg) - The distance that data has to travel affects the performance of a network. - Both wired and wireless connections may need repeaters to boost the strength of the signal carrying the data packets. - Devices are slower, especially on a wireless network, the further away a device is from the wireless access point - Latency is the delay before data begins transferring. - Wireless networks usually have higher latency than wired. - Long distances or too many network hops increase latency. ### Interference ![Interference](https://image-v2.cdn.app.senecalearning.com/2020-12/28867216-1f26-4eb2-acf9-c59a264fd2f0/lagis-building-nigeria.jpg) - Certain physical materials do not allow wireless signals to pass through. - This type of interference increases the rate at which data packets are lost. - Have you ever entered a building and lost your phone signal? This may be because of the construction of the building. ## Network Performance: Solutions Here are some possible ways to improve the performance of a network. ### Wired vs wireless ![Wired vs wireless](https://image-v2.cdn.app.senecalearning.com/2021-04/5400b5f8-a2e1-4f24-870d-f87918a77b42/Captura%20de%20tela%202021-04-10%20191908%201.png) - Problem: Wireless networks suffer from interference, weak signal strength, and congestion. - Solution: - Switch to a wired Ethernet connection for devices that need stable, high-speed performance. - Place the Wi-Fi router centrally to improve coverage. - Upgrade to dual-band or tri-band Wi-Fi (2.4 GHz + 5 GHz) to reduce interference. ### Hardware Type ![Hardware Type](https://image-v2.cdn.app.senecalearning.com/2018-07/bae2b97f-0533-44fd-8776-f1deba37c207/LAN-Local-Area-Connection-Computer-.jpg) - Problem: Copper cables are slower and more susceptible to interference. - Solution: - Upgrade to fibre optic cables, which provide higher speeds, longer distances, and immunity to electrical interference. - Replace old Cat5 cables with Cat6 or Cat6a Ethernet cables for faster wired connections. ### Network topology ![Network topology](https://image-v2.cdn.app.senecalearning.com/2019-04/0f39ba16-244b-4165-9cdb-cf3a723eb130/1.5.1%20Star%20topology.png) - Problem: Inefficient topologies (like bus) reduce performance as more devices join. - Solution: - Use a star topology, where each device connects to a central switch for better speed and reliability. - For large, mission-critical networks, use mesh topology to provide multiple data routes and reduce congestion. ### Bandwidth ![Bandwidth](https://image-v2.cdn.app.senecalearning.com/2019-09/52d1c263-bb8d-415c-847b-2d4d4797eac7/acer-device-digital-marketing-6168.jpg) - Problem: Many devices share limited bandwidth, slowing the network. - Solution: - Increase the available bandwidth from the ISP (upgrade broadband package). - Use Quality of Service (QoS) settings on the router to prioritise important traffic (e.g., video calls, gaming). - Reduce unnecessary background usage (e.g., cloud backups during peak hours). ### Number of users ![Number of users](https://image-v2.cdn.app.senecalearning.com/2018-08/f1a1e264-f346-4f72-a16b-3e46f2e44ee0/Devices-laptops-office-.jpg) - Problem: Too many users/devices overload the network. - Solution: - Add extra access points or Wi-Fi extenders to spread the load. - Split devices between 2.4 GHz and 5 GHz bands. - Use wired connections for some devices to reduce wireless traffic. ### Interference ![Interference](https://image-v2.cdn.app.senecalearning.com/2018-07/d76addcb-0eff-4c0e-9f52-81b2d3190629/Wirless-Controller-Wifi-WIC-Interface-.jpg) - Problem: Wireless signals are disrupted by physical barriers or other electronics. - Solution: - Change the Wi-Fi channel to avoid interference from neighbouring networks. - Move the router away from microwaves, cordless phones, and thick walls. - Upgrade to Wi-Fi 5 or Wi-Fi 6, which handle interference better. ## Test yourself on Network Performance - Which of the following are true of networks? - Which connection type usually provides the most stable and fastest performance? - What is one disadvantage of wireless networks compared to wired networks? - Which network topology often provides the best performance because each device connects directly to a central switch? - What does bandwidth measure? [Practise this topic for free](https://app.senecalearning.com/classroom/course/a1ce4570-6e27-11e8-af4b-35cf52f905c2/section/6f9a36c6-db8e-4762-98fd-5541016a4e87/session) - Previous topic: [1.3.2 Types of Networks](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-3-2-types-of-networks.md) - Next topic: [1.3.4 Networks: How Do Packets Get Routed?](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-3-4-networks-how-do-packets-get-routed.md) ## Computer Science: OCR GCSE contents ### 1 Computer Systems - 1.1 Systems Architecture - [1.1.1 Fetch-Execute Cycle](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-1-1-fetch-execute-cycle.md) - [1.1.2 Common CPU Components & Their Function](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-1-2-common-cpu-components-and-their-function.md) - [1.1.3 Von Neumann Architecture](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-1-3-von-neumann-architecture.md) - [1.1.4 Factors Affecting CPU Performance](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-1-4-factors-affecting-cpu-performance.md) - [1.1.5 Embedded Systems](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-1-5-embedded-systems.md) - [1.1.6 Exam-Style Questions - Von Neumann Architecture](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-1-6-exam-style-questions-von-neumann-architecture.md) - [1.1.7 Diagnostic Misconceptions - Embedded vs General](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-1-7-diagnostic-misconceptions-embedded-vs-general.md) - 1.2 Memory & Storage - [1.2.1 Types of Memory](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-2-1-types-of-memory.md) - [1.2.2 Flash Memory](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-2-2-flash-memory.md) - [1.2.3 Properties of Flash Memory](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-2-3-properties-of-flash-memory.md) - [1.2.4 Running Out of Memory](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-2-4-running-out-of-memory.md) - [1.2.5 Virtual Memory](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-2-5-virtual-memory.md) - [1.2.6 Units of Capacity](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-2-6-units-of-capacity.md) - [1.2.7 Calculating Capacity Requirements](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-2-7-calculating-capacity-requirements.md) - [1.2.8 Solid State Storage](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-2-8-solid-state-storage.md) - [1.2.9 Properties of Solid State Media](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-2-9-properties-of-solid-state-media.md) - [1.2.10 Magnetic Storage](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-2-10-magnetic-storage.md) - [1.2.11 Properties of Magnetic Media](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-2-11-properties-of-magnetic-media.md) - [1.2.12 Examples of Magnetic Storage](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-2-12-examples-of-magnetic-storage.md) - [1.2.13 Optical Storage](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-2-13-optical-storage.md) - [1.2.14 Properties of Optical Media](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-2-14-properties-of-optical-media.md) - [1.2.15 Examples of Optical Storage](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-2-15-examples-of-optical-storage.md) - [1.2.16 Types of Optical Disk](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-2-16-types-of-optical-disk.md) - [1.2.17 Number Bases](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-2-17-number-bases.md) - [1.2.18 Converting Number Bases](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-2-18-converting-number-bases.md) - [1.2.19 Hexadecimal](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-2-19-hexadecimal.md) - [1.2.20 Using Hexadecimal](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-2-20-using-hexadecimal.md) - [1.2.21 Converting Denary & Hexadecimal](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-2-21-converting-denary-and-hexadecimal.md) - [1.2.22 Binary Addition](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-2-22-binary-addition.md) - [1.2.23 Binary Shifts](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-2-23-binary-shifts.md) - [1.2.24 Representing Text](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-2-24-representing-text.md) - [1.2.25 ASCII & Unicode](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-2-25-ascii-and-unicode.md) - [1.2.26 Representing Images](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-2-26-representing-images.md) - [1.2.27 Converting Binary & Images](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-2-27-converting-binary-and-images.md) - [1.2.28 Representing Sound](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-2-28-representing-sound.md) - [1.2.29 Data Compression](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-2-29-data-compression.md) - [1.2.30 Grade 9 - Storage](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-2-30-grade-9-storage.md) - [1.2.31 Exam-Style Questions - Primary Memory](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-2-31-exam-style-questions-primary-memory.md) - [1.2.32 Exam-Style Questions - Storage](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-2-32-exam-style-questions-storage.md) - [1.2.33 Exam-Style Questions - Data Conversions](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-2-33-exam-style-questions-data-conversions.md) - [1.2.34 Diagnostic Misconceptions - RAM vs ROM](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-2-34-diagnostic-misconceptions-ram-vs-rom.md) - [1.2.35 Diagnostic Misconceptions - Bits, Nibbles & Bytes](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-2-35-diagnostic-misconceptions-bits-nibbles-and-bytes.md) - [1.2.36 Diagnostic Misconceptions - Bits Required to Store](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-2-36-diagnostic-misconceptions-bits-required-to-store.md) - [1.2.37 End of Topic Test - Computer Systems](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-2-37-end-of-topic-test-computer-systems.md) - [1.2.38 End of Topic Test - Representation](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-2-38-end-of-topic-test-representation.md) - 1.3 Computer Networks, Connections & Protocols - [1.3.1 Benefit of Networks](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-3-1-benefit-of-networks.md) - [1.3.2 Types of Networks](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-3-2-types-of-networks.md) - [1.3.3 Network Performance](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-3-3-network-performance.md) - [1.3.4 Networks: How Do Packets Get Routed?](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-3-4-networks-how-do-packets-get-routed.md) - [1.3.5 Client-Server Model](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-3-5-client-server-model.md) - [1.3.6 Pros & Cons of Client-Server Model](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-3-6-pros-and-cons-of-client-server-model.md) - [1.3.7 Peer-to-Peer Model](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-3-7-peer-to-peer-model.md) - [1.3.8 Pros & Cons of Peer-to-Peer Model](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-3-8-pros-and-cons-of-peer-to-peer-model.md) - [1.3.9 Network Hardware](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-3-9-network-hardware.md) - [1.3.10 Transmission Media](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-3-10-transmission-media.md) - [1.3.11 What is the Internet?](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-3-11-what-is-the-internet.md) - [1.3.12 URLs](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-3-12-urls.md) - [1.3.13 DNS & Web Hosting](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-3-13-dns-and-web-hosting.md) - [1.3.14 The Cloud](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-3-14-the-cloud.md) - [1.3.15 Pros & Cons of the Cloud](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-3-15-pros-and-cons-of-the-cloud.md) - [1.3.16 Star & Mesh Network Topologies](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-3-16-star-and-mesh-network-topologies.md) - [1.3.17 WiFi](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-3-17-wifi.md) - [1.3.18 WiFi Frequency & Channels](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-3-18-wifi-frequency-and-channels.md) - [1.3.19 WiFi Encryption](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-3-19-wifi-encryption.md) - [1.3.20 IP Addresses](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-3-20-ip-addresses.md) - [1.3.21 MAC Addresses](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-3-21-mac-addresses.md) - [1.3.22 Network Protocols](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-3-22-network-protocols.md) - [1.3.23 Transmission Protocols](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-3-23-transmission-protocols.md) - [1.3.24 Application Protocols](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-3-24-application-protocols.md) - [1.3.25 Layers](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-3-25-layers.md) - [1.3.26 Advantages of Layering](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-3-26-advantages-of-layering.md) - [1.3.27 Exam-Style Questions - Networking Models](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-3-27-exam-style-questions-networking-models.md) - [1.3.28 Exam-Style Questions - Network Protocols](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-3-28-exam-style-questions-network-protocols.md) - [1.3.29 Diagnostic Misconceptions - LAN vs WAN](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-3-29-diagnostic-misconceptions-lan-vs-wan.md) - 1.4 Network Security - [1.4.1 Forms of Attack](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-4-1-forms-of-attack.md) - [1.4.2 Penetration Testing](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-4-2-penetration-testing.md) - [1.4.3 Malware](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-4-3-malware.md) - [1.4.4 How Malware Spreads](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-4-4-how-malware-spreads.md) - [1.4.5 Social Engineering](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-4-5-social-engineering.md) - [1.4.6 Phishing](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-4-6-phishing.md) - [1.4.7 Cracking Passwords](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-4-7-cracking-passwords.md) - [1.4.8 Denial of Service Attacks](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-4-8-denial-of-service-attacks.md) - [1.4.9 Data Interception](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-4-9-data-interception.md) - [1.4.10 Methods of Data Interception](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-4-10-methods-of-data-interception.md) - [1.4.11 SQL Injection](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-4-11-sql-injection.md) - [1.4.12 Network Administration](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-4-12-network-administration.md) - [1.4.13 Network Forensics](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-4-13-network-forensics.md) - [1.4.14 Protecting Against Malware](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-4-14-protecting-against-malware.md) - [1.4.15 Firewalls](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-4-15-firewalls.md) - [1.4.16 User Access Levels](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-4-16-user-access-levels.md) - [1.4.17 Passwords](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-4-17-passwords.md) - [1.4.18 Encryption](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-4-18-encryption.md) - [1.4.19 End of Topic Test - Networks](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-4-19-end-of-topic-test-networks.md) - 1.5 Systems Software - [1.5.1 System Software](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-5-1-system-software.md) - [1.5.2 Utility Software](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-5-2-utility-software.md) - [1.5.3 Operating Systems](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-5-3-operating-systems.md) - [1.5.4 User Interfaces](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-5-4-user-interfaces.md) - [1.5.5 Memory & Process Management](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-5-5-memory-and-process-management.md) - [1.5.6 File Management](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-5-6-file-management.md) - [1.5.7 Device Management](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-5-7-device-management.md) - [1.5.8 User Management](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-5-8-user-management.md) - [1.5.9 Encryption Software](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-5-9-encryption-software.md) - [1.5.10 Defragmentation Software](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-5-10-defragmentation-software.md) - [1.5.11 Data Compression Software](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-5-11-data-compression-software.md) - [1.5.12 Backup Software](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-5-12-backup-software.md) - 1.6 Ethical, Legal, Cultural & Environmental Concern - [1.6.1 Open Source Software](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-6-1-open-source-software.md) - [1.6.2 Proprietary Software](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-6-2-proprietary-software.md) - [1.6.3 Licensing Issues](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-6-3-licensing-issues.md) - [1.6.4 Ethical Issues - The Digital Divide](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-6-4-ethical-issues-the-digital-divide.md) - [1.6.5 Ethical Issues - Net Neutrality](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-6-5-ethical-issues-net-neutrality.md) - [1.6.6 Ethical Issues - Working Conditions](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-6-6-ethical-issues-working-conditions.md) - [1.6.7 Ethical Issues - Censorship](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-6-7-ethical-issues-censorship.md) - [1.6.8 Exam-Style Questions - Ethical Issues](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-6-8-exam-style-questions-ethical-issues.md) - [1.6.9 Data Protection Act 1998](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-6-9-data-protection-act-1998.md) - [1.6.10 Computer Misuse Act (1990)](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-6-10-computer-misuse-act-1990.md) - [1.6.11 Copyright Designs & Patents Act (1988)](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-6-11-copyright-designs-and-patents-act-1988.md) - [1.6.12 Creative Commons Licensing](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-6-12-creative-commons-licensing.md) - [1.6.13 Freedom of Information Act (2000)](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-6-13-freedom-of-information-act-2000.md) - [1.6.14 Cultural Issues](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-6-14-cultural-issues.md) - [1.6.15 Environmental Issues](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-6-15-environmental-issues.md) - [1.6.16 Online Activity Tracking & The Internet of Things](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-6-16-online-activity-tracking-and-the-internet-of-things.md) - [1.6.17 Stakeholders](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-6-17-stakeholders.md) - [1.6.18 Other Impacts of Digital Technology on Society](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-6-18-other-impacts-of-digital-technology-on-society.md) - [1.6.19 End of Topic Test - Software & Issues](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-6-19-end-of-topic-test-software-and-issues.md) - [1.6.20 Diagnostic Misconceptions - Open Source](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/1-6-20-diagnostic-misconceptions-open-source.md) ### 2 Computational Thinking, Algorithms & Programming - 2.1 Algorithms - [2.1.1 Computational Thinking - Abstraction](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-1-1-computational-thinking-abstraction.md) - [2.1.2 Computational Thinking - Decomposition](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-1-2-computational-thinking-decomposition.md) - [2.1.3 Algorithmic Thinking](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-1-3-algorithmic-thinking.md) - [2.1.4 Pseudocode](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-1-4-pseudocode.md) - [2.1.5 Flowchart Diagrams](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-1-5-flowchart-diagrams.md) - [2.1.6 Interpreting Algorithms](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-1-6-interpreting-algorithms.md) - [2.1.7 Correcting Algorithms](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-1-7-correcting-algorithms.md) - [2.1.8 Completing Algorithms](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-1-8-completing-algorithms.md) - [2.1.9 Search Algorithms](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-1-9-search-algorithms.md) - [2.1.10 Binary Search](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-1-10-binary-search.md) - [2.1.11 Linear Search](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-1-11-linear-search.md) - [2.1.12 Overview of Sort Algorithms](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-1-12-overview-of-sort-algorithms.md) - [2.1.13 Bubble Sort](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-1-13-bubble-sort.md) - [2.1.14 Merge Sort](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-1-14-merge-sort.md) - [2.1.15 Insertion Sort](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-1-15-insertion-sort.md) - [2.1.16 Exam-Style Questions - Sorting Algorithms](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-1-16-exam-style-questions-sorting-algorithms.md) - 2.2 Programming Fundamentals - [2.2.1 Variable Declaration & Assignment](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-2-1-variable-declaration-and-assignment.md) - [2.2.2 Input & Output](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-2-2-input-and-output.md) - [2.2.3 Program Flow - Sequence](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-2-3-program-flow-sequence.md) - [2.2.4 Program Flow - Selection](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-2-4-program-flow-selection.md) - [2.2.5 Program Flow - Iteration](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-2-5-program-flow-iteration.md) - [2.2.6 Arithmetic Operators](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-2-6-arithmetic-operators.md) - [2.2.7 Relational Operators](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-2-7-relational-operators.md) - [2.2.8 Boolean Operators](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-2-8-boolean-operators.md) - [2.2.9 Data Types](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-2-9-data-types.md) - [2.2.10 Casting](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-2-10-casting.md) - [2.2.11 Arrays](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-2-11-arrays.md) - [2.2.12 Strings](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-2-12-strings.md) - [2.2.13 File Handling](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-2-13-file-handling.md) - [2.2.14 Structuring Data - Records](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-2-14-structuring-data-records.md) - [2.2.15 Structured Query Language](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-2-15-structured-query-language.md) - [2.2.16 Random Number Generation](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-2-16-random-number-generation.md) - [2.2.17 End of Topic Test - Programming](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-2-17-end-of-topic-test-programming.md) - [2.2.18 Exam-Style Questions - Translation](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-2-18-exam-style-questions-translation.md) - [2.2.19 Diagnostic Misconceptions - Comparison Operators](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-2-19-diagnostic-misconceptions-comparison-operators.md) - [2.2.20 Diagnostic Misconceptions - = & ==](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-2-20-diagnostic-misconceptions-=-and-==.md) - [2.2.21 Diagnostic Misconceptions - Types of Data](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-2-21-diagnostic-misconceptions-types-of-data.md) - [2.2.22 Diagnostic Misconceptions - Last Line of Code](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-2-22-diagnostic-misconceptions-last-line-of-code.md) - [2.2.23 Diagnostic Misconceptions - Array Index](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-2-23-diagnostic-misconceptions-array-index.md) - 2.3 Producing Robust Programs - [2.3.1 Defensive Design](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-3-1-defensive-design.md) - [2.3.2 Validation & Sanitisation](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-3-2-validation-and-sanitisation.md) - [2.3.3 Authentication & Contingencies](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-3-3-authentication-and-contingencies.md) - [2.3.4 Maintainability](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-3-4-maintainability.md) - [2.3.5 Purpose of Testing](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-3-5-purpose-of-testing.md) - [2.3.6 Types of Testing](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-3-6-types-of-testing.md) - [2.3.7 Test Plans](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-3-7-test-plans.md) - [2.3.8 Types of Errors](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-3-8-types-of-errors.md) - [2.3.9 End of Topic Test - Programming](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-3-9-end-of-topic-test-programming.md) - [2.3.10 Exam-Style Questions - Testing](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-3-10-exam-style-questions-testing.md) - 2.4 Boolean Logic - [2.4.1 Binary Systems](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-4-1-binary-systems.md) - [2.4.2 Logic Circuits](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-4-2-logic-circuits.md) - [2.4.3 Boolean Logic](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-4-3-boolean-logic.md) - [2.4.4 Boolean Operators](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-4-4-boolean-operators.md) - [2.4.5 Grade 9 - Logic](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-4-5-grade-9-logic.md) - 2.5 Programming Languages & IDEs - [2.5.1 High-Level vs Low-Level Languages](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-5-1-high-level-vs-low-level-languages.md) - [2.5.2 Translation - Compliers & Interpreter](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-5-2-translation-compliers-and-interpreter.md) - [2.5.3 Translation - Assemblers](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-5-3-translation-assemblers.md) - [2.5.4 Integrated Development Environments](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-5-4-integrated-development-environments.md) - [2.5.5 Exam-Style Questions - Translation](https://senecalearning.com/en-gb/revision-notes/gcse/computer-science/ocr/2-5-5-exam-style-questions-translation.md)