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Computer networks: LAN, WAN, devices and topologies
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- 1What is a computer network?2 or more computers connected together to share resources and data.
- 2What does WAN mean?WAN stands for Wide Area Network.
- 3What does LAN mean?LAN means Local Area Network.
- 4Describe a LAN?It is a connected set of computers and devices and each device is called a node (e.g. computer, printer, ext.)
- 5Describe a WAN?Cover a large geographical area: Cables, telephone lines, satellites and radio waves to connect. Examples include: International banking systems and ATM machines and the internet.
- 6What are the advantages of a network?Peripherals, like printers and scanners can be shared. The whole network can be backed up centrally. Messages can be sent in between users. Users can share files, which prevents duplication of information. Software for a network is cheaper than individual licences.
- 7What are the disadvantages of a network?A trained person is needed to manage the network. Wiring can be expensive to buy and install.
- 8What devices are needed to produce a LAN?Server, terminal, laptop, printer, cloud, router, hub, switch, WI-FI and tablets.
- 9What is the purpose of a NIC?Short for Network Interface Card, the NIC is also referred to as an Ethernet card and network adaptor. It is an expansion card that enables a computer to connect to a network.
- 10What is the purpose of a router?In order for devices on the network to connect to the Internet, the router must be connected to a modem.
- 11What is the purpose of a Hub?A hub is a common connection point for devices in a network. Hubs are commonly used to connect segments of a LAN. A hub contains multiple ports. When a packet arrives at one port, it is copied to the other ports so that all segments of the LAN can see all packets
- 12What is the purpose of a Switch?Just as switches allow different devices on a network to communicate, routers allow different networks to communicate. A router also connects networked computers to the Internet, allowing multiple users to share a connection. And a router acts as a dispatcher.
- 13What is the difference between a hub and a switch?There are three main devices that work to connect one computer to another computer. A network hub, switch, and router can all perform this function. It can sometimes be confusing when trying to figure out what device is currently being used on a computer network, without knowing what each device does
- 14What is the internet?A global computer network providing a variety of information and communication facilities, consisting of interconnected networks using standardised communication protocols
- 15What is the world wide web?An information system on the Internet which allows documents to be connected to other documents by hypertext links, enabling the user to search for information by moving from one document to another.
- 16What is the purpose of a modem?Modem stands for MODulator/DEModulator. A modem converts digital signals generated by the computer into analogue signals which can be transmitted over a telephone or cable line and transforms incoming analogue signals into their digital equivalents.
- 17What is the purpose of ISP?An Internet service provider (ISP) is an organisation that provides services accessing and using the Internet. Internet service providers may be organised in various forms, such as commercial, community-owned, non-profit, or otherwise privately owned.
- 18What are the 3 topology's?Star, Bus and Ring.
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- Fichas sobre Sin título, creado por Benedict Crowley el 01/12/2017.
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- Benedict Crowley
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