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Revision cards for AQA AS INFO2 Transfer of Data (Networks)

What is a Local Area Network (LAN)? A network covering a single site such as a school or office, linked via Ethernet cables or wireless technology
What is a Wide Area Network (WAN)? A network over a large geographical area, such as a multinational company, linked via telephone cables, satellite links or microwave
What is a peer-to-peer network? A small network where computers are linked directly or via a hub or router to enable sharing of files and peripherals (e.g. printer). All machines have equal status.
What is a client-server network? A larger network with a central server that controls access and stores data. Client workstations connect to the server to access data and services.
What are the advantages of a network? (6) Allows sharing of peripherals which cuts equipment costs, allows internal e-mail, can share files easily. Client-server networks also give improved security, centralised backup and allow you to access your files on any workstation.
What are the disadvantages of a network? (5) If the server fails users cannot access their files, extra hardware costs, client-server networks require specialist staff, network performance can be slow with heavy usage or poor set-up, viruses can spread easily if security isn't up to date
What is the difference between the Internet and the World Wide Web? Internet = network of interconnected computers around the world that allow the sending and retrieval of information, including e-mail. WWW = a collection of multimedia resources accessible via the Internet.
Why do we need standards? So that different devices can be connected to any computer system (e.g. via USB standard) and different computer systems can communicate with each other.