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Algorithms

Abstraction is the representation of essential features without including unnecessary details.  It is used to reduce the complexity of systems for users, hiding how things actually work, applying algorithms to different contexts and producing suitable user interfaces.  The first video explains the...
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Ethical, Legal, Cultural and Environmental Concerns

The first video introduces a range of concerns surrounding computing technologies.  The idea that new technologies bring with them new social and ethical issues, and that the law is often slow to catch-up to guard people against these issues.  Some of the benefits of new technologies are briefly...
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Systems Software

The first video outlines the purpose of systems software: the operating system and utilities.  It consider the role of systems software in providing a user interface and abstraction to the physical hardware.  A variety of different types of user interface are explained in more detail.The second ...
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System Security

The first video introduces the variety of threats to system security.  Malware, phishing, brute force attacks, denial of service, data interception/theft and SQL injection are all considered and explained.  Simple notes on each of these are presented toward the end of the video.The second video...
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Network Topologies – Protocols and Layers

The first video examines the topology of modern networks – how the computers are arranged and connected together.  The history of network topologies is outlined briefly, before considering star networks in more detail.  The need for, and the advantages of a central switch, together with the concept of...
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Wired and Wireless Networks

The first video explores the two main types of networks: local area networks (LAN) and wide area networks (WAN).  The reasons for networking stand-alone computers are outlined, and the potential disadvantages too.  The connection options for devices on a network are briefly mentioned and covered in more...
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Storage

The first video explains why a computer needs secondary storage, and explains what is meant by primary and tertiary storage.The second video explains what is meant by the term “capacity” of storage devices.  The relative size of different types of files is introduced.  (More detailed explanations...
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Systems Architecture

The first video explores the first computers that had stored programs in the same memory space as the data required for them.  This is known as the von Neumann architecture and is still the foundation principle on which most computers are still built today.  We take the lid off a central processing unit and...
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Memory

The first video explores the purpose of both RAM and ROM in a typical computer system.  The differences between the two memory types are outlined.The second video considers what happens when a modern multi-tasking operating system runs out of physical RAM.  Does it output a “memory full” message and refuse...
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Craig ’n’ Dave OCR GCSE Computer Science

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