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Networks

Explore the components and advantages of network systems, including different types of networks and communication channels. Learn about network security and communication interfaces.

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Networks

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  1. Networks Grade 10

  2. The Network System • A network links components electronically. • Each component is a NODE. A node could be: • A PC • A printer • A modem etc. • The essential components of a network are • Network devices (e.g. computers, printers) • Communication channels (e.g. cables) • Network interface cards • Network software.

  3. Types of Networks • Networks can be: • Simple  two computers at home could be linked directly. If both have the same control  called a peer-to-peer network. • Complex  server based the server controls the components linked together in the network.

  4. Advantages of a network • Share Resources • Centralise and update data in one place • Centralise programs on server  Upgrades can be done in one place • Files transfer is easy. • Contact maintained by using e-mail which can also update Inter-Office appointments. • Security is maintained  sensitive material is restricted from general use. • Networks save time and resources. They improve productivity and also save money.

  5. Disadvantages of a network • are always a concern in a network. • A well managed network will restrict unauthorised users • Each user will have a profile protected by a password. • Rules for creating a password • Don’t use things that a user can guess like a pet’s name, a boy or girl friend’s name, your birth date etc. • Change your password regularly especially if you think it has been guessed. • Never use a sequence of letters or numbers (e.g. 12345 or abcde) • Use an alphanumeric code • Make some of the letters uppercase • Substitute numbers for some of the letters Sabelo8Ab310 • DO NOT write it down!

  6. Black, Grey and White Hats • Black Hatsgain access to try to steal or destroy information They will leave a message so that people will know that they have been in. • Grey Hats  ½ a White and ½ a Black Hat. They enjoy the challenge of breaking in – will usually inform the company and suggest payment for providing a fix for the security breach. • White Hats will do it for a challenge and will let the company know how to fix it.

  7. Examples of networks • PAN(Personal Area Network) e.g. pictures taken with your cell phone can be sent to your printer. • HAN  (Home Area Network)  2 or more PC’s in a home are connected to share resources, • OAN  (Office Area Network)  a small office connecting as above • LAN  (Local Area Network)  exists in a company within a small geographical space e.g. one office complex. • WAN (Wide Area Networks) cover a vast geographical span e.g. between offices and the head office, various colleges of a university etc. • GAN  (Global Area Networks)  refers tothe internet or a company with ties to a company in another country usually via satellite.

  8. Communication Channels • Telephone lines • Coaxial Cables • UTP cabling • Microwave Transmission • Fibre Optic cables • Infrared Transmission • Cellular Radio Systems

  9. Communications Interfaces • An interface is a piece of hardware that helps various devices to communicate. There are many ways that different communication components can be linked: • Modem • Switch • Router

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