GCSE Computer Science

Computer systems and networks
revision.

What the CPU actually does, and how machines share data without chaos.

Computer systems and networks guides

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Revision guideNetwork hardware

Students type: network hardware GCSE

Open guide Revision guideInput and output devices

Students type: input output devices GCSE computer science

Open guide Revision guideCompilers and interpreters

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Open guide Revision guideTCP/IP layers

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Open guide Revision guideVon Neumann architecture

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Open guide Revision guideThe fetch–decode–execute cycle

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Open guide Revision guideSystems architecture

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Open guide Revision guideNetworks

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01

Networks

LANs and WANs, hardware, topologies, protocols, DNS and the factors that make a network fast, reliable or neither.

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Systems architecture

The CPU’s fetch–decode–execute cycle, what actually speeds a processor up, memory versus storage, and embedded systems.

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The fetch–decode–execute cycle

GCSE Computer Science fetch–decode–execute: how the PC, MAR, MDR, CIR and ALU move one instruction from memory through the CPU, every cycle.

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Von Neumann architecture

GCSE Computer Science Von Neumann architecture: stored program, shared memory for instructions and data, and the bottleneck that comes from one bus doing both jobs.

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05

TCP/IP layers

GCSE Computer Science TCP/IP: application, transport, internet and network-access layers, what each one is for, and how a packet is passed down and back up the stack.

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Compilers and interpreters

GCSE Computer Science compilers and interpreters: translate high-level code to machine code, compile-time versus run-time translation, and when each translator is used.

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Input and output devices

GCSE Computer Science input and output devices: sensors, keyboards, touchscreens, monitors, actuators, printers — data flow into and out of the CPU.

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Network hardware

GCSE Computer Science network hardware: router, switch, hub, wireless access point, NIC, modem — roles in LAN, WAN and the internet.

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Keep going

More GCSE Computer Science
in the same style.

GCSE Computer Science revision for algorithms, programming, binary, networks, cyber security, systems architecture and Boolean logic — with trace tables, not hand-waving.

All Computer Science revision