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Networks (2)

Networks (2). Mr Conti Lesson 2. Learning Objectives. By the end of this presentation we will have learned: what a network is the advantages and disadvantages of networks about the topology of networks about different types of network. Socrative. Base Knowledge www.socrative.com

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Networks (2)

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  1. Networks (2) Mr Conti Lesson 2

  2. Learning Objectives • By the end of this presentation we will have learned: • what a network is • the advantages and disadvantages of networks • about the topology of networks • about different types of network.

  3. Socrative Base Knowledge www.socrative.com Room No: 161099

  4. Using school computers What rules are there about using school computers? • Each user must have a unique username and password. • Users must log on and log off each time they use a computer. • Users must choose a password that only they know, and remember it and keep it private. Why do these rules exist? • Because the computers are in a network.

  5. What is a Network? • A network is a group of computers that are linked together. Each computer is connected (via a switch) to a server. • The server is a very powerful computer that provides programs and storage space for other computers. • When you use programs and save files on school computers, you are actually saving them on the server. • Networks are beneficial because software, storage, peripherals and processing powercan be shared. What is your school computer network made up of?

  6. Starter TaskThink-Pair-Share • Today anyone who uses a computer, tablet, e-reader, smartphone or many other digital devices is likely to be connected to a network. • Networks differ in size. They may cover a room, house or office, or could even be global. Which devices have you used to connect to a network this week?

  7. The Advantages of Networks • As with any form of technology, networks are only used when the advantages outweigh the disadvantages. • The main advantage of a network is that resources such as printers are shared. This means that each computer on the network does not need its own printer, and a user does not have to move to a different computer to print something. How is business 2 better organised than business 1? Business 1 Business 2

  8. Answer • Business 2 saves money in comparison with business 1 because it doesn’t need to buy as many printers. • It also saves time as employees don’t have to keep moving around to use a printer.

  9. Network cards In order for a computer to function as part of a network, it has to have a special piece of equipment called a network interface card (NIC) installed. • A NIC has a port for a network cable to be connected. • NICs are still very common, but increasingly people are using wireless network cards or wireless USB adaptors.

  10. Wireless networks • It is possible to connect computers on a LAN without using wires. A wireless network cardis similar to a standard NIC but has a transmitter/receiver for sending signals via radio waves. • Wireless networks are popular as they allow the user more freedom, such as working outside. Are there any disadvantages to using wireless networks?

  11. Answer • Wireless networks can drop out due to interference. They may also be a lot slower at data transfer than wired networks. Wireless networks are also more susceptible to being accessed by unauthorised users. ‘Piggybacking’ is a term used to describe someone accessing a wireless network without authorisation.

  12. Hubs

  13. Routers

  14. Switches

  15. Describing Networks

  16. Socrative www.socrative.com Room No: 161099 Extension Task Consider different parts of your school buildings, or the places where you live, and discuss their suitability for wireless networks.

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