Communications, Networks and Internet

1. Communications, Networks and Internet

2. Communication • This growth in communications technology has revolutionized the way the businesses work and keep in touch with staff and customers

3. Method of communication • Telephone • Internet- Facebook, Twitter,Tumblr,Gmail • Skype • Flair • MSN • MySpace • Letter • Sonar • Sounds • Facial expression • ICQ • Text message • BBM • Mix it • OOVOO • Speech

4. Network • A network consists of two or more computers that are linked in order to share resources e.g. exchange files, communicate • The computers on a network may be linked through cables, telephone lines, radio waves, satellites, or infrared light beams • There are 2 types: WAN LAN

5. Local area network (LAN) Supplies networking capability to a group of computers in close proximity to each other such as in an office building, a school, or a home • A LAN is useful for sharing resources like files, printers, games or other applications Advantages: • Software and data files can be shared • Users can work together on a single shared document • Users can communicate e.g. Messenger • Users can stream media, so they can view video and play audio • It saves time and money, to install the software on one main computer • You can share hardware devices and internet connection

6. Types of LAN Client networks: • For those available to you to use Server networks Peer-to-peer networks: • Allows every computer to communicate directly with every other computer in the network • A user can access data from any computer on the network • Is limited to about 10 machines • Found in small businesses and departments

7. Cabled LAN vs. Wireless lan • All computers and other peripheral devices on the network are attached to cables that transmit data between them • A network cable is required • Usesses a wireless link to connect to the network • Slower transmission speed • Has 3 sets of componets: • Wireless points • Wireless interface cards • Routers

8. Wide Area Network (wAN) • A large geographic area • In a state, province or country • WANs often connect multiple smaller networks • The world's most popular WAN is the Internet

9. Difference between stand-alone and workstation • A stand-alone PC works on its own • A workstation is connected to a network, you can freely share your files and databases to other PC.

10. How can you tell whether a computer is networked to other computers • It allows you to send messages to a friend who is working on another computer • A message will tell you that you are entering a networked system when you logon • You have a choice to chose your printer • You have a file server

11. A file server • Is a powerful computer that runs the network operating system and allows resources to be shared over the networked by other devices and computers connecting to it • These devices could include printers, disks,drives,CD-ROM drives, camera,etc • Must be kept in a cool temperature room • Has to be in a dust free room • Has to be in a secured room

12. Print server • Coordinates printing on the network

13. Bluetooth vs. wi-fi • 10 meters • Mobile phones, mouse, keyboards • Simple to use • Low cost • Developed in 1994 • Notebook, PC, desktop • 100 meters • More complex • High cost • Developed in 1991