1. Computer and Information Science Ch1.3 Computer Networking Ch1.3 Computer Networking Chapter 1

2. NetworksNetworks n Computer Network: series of computers linked together to share data, hardware, and software n Local Area Network (LAN) : series of computers networked together over a relatively limited area –campus –building

3. Stand-alone computer — a computer not connected to a network. Workstation — name for a computer when it is connected to a network. Local resources — workstation ’ s typical resources: hard drive, software, data, and printer. Network resources — additional resources you have access to when connected to a network: application software, storage space for data files, and shared printers. Key Network Terms

4. Network server — a computer connected to the network that distributes resources to network users. Network printer — a shared printer that provides output capabilities to all network users. Node — a device on a network, including workstations, servers, and printers.

5. n Identifies you as a user on the network n Logically connects a workstation to network drives and other resources n Requires a user to enter a user ID and password The login process...

6. User account — provides access to network resources. Network administrator or supervisor — person responsible for setting up user accounts and maintaining the network.

7. Mapping — assigning drive letters to network server disk drives. What drives are available??

8. View a directory or access files on network server drive F just as you would drives A and C. Your workstation floppy drive A Network server drive F Your workstation hard disk drive C Network printer

9. Using Programs on the Network Step #1

10. Step #2

11. Step #3

12. n Disk storage space n Time and effort in updating software n Licensing costs Sharing a program — with proper licensing many network users can access a program at the same time and save...

13. Parallel port Workstation Network printer Using a Network Printer  The login process usually assigns a network printer to your workstation.  Output is redirected (captured) from the parallel port to the network printer.

14. Two documents are sent to a network printer at the same time... Print Queue: 1. Ceo.Doc 2. Gnp.Doc Ceo.doc arrives first Gnp.doc arrives before printer completes Ceo.doc Print queue — special holding area on the network server where files are stored until they are printed.

15. Network interface card (NIC) — small circuit board that plugs into expansion slot. – Key component for connecting your computer to a local area network – Sends data from a workstation over the network – Collects incoming data intended for your workstation Network Hardware

16. Desktop network interface card (NIC)

17. Connecting Networks n Similar to telephone cable n Has a plastic RJ- 45 connector on either end Twisted pair cable (UTP) —

18. Wireless networks use radio or infrared signals to transmit data from one network device to another. The network interface card contains the transmitting devices. Other Network Connectors

19. n Provide mobility n Are used in environments where wiring is hard to install n Can be good for temporary installations Wireless networks:

20. Software for Networks A network requires some special network software in addition to much of the same application software typical of standalone computers.

21. Network license: n Permits specified number of people to use software on a network n Costs more than one single-user license but less than individual licenses for all network users n Available for most software packages by contacting the publisher

22. E-mailE-mail Electronic mail (e-mail) is correspondence conducted between users on a computer network. Electronic mail (e-mail) is correspondence conducted between users on a computer network.

23. n E-mail messages are stored on a server n When you read your mail, the server forwards it to your workstation Store and forward technology:

24. Mail server Your workstation 1. E-mail addressed to you is sent to the mail server 2. Mail stays on the mail server until you log on to your mail client. 3. Server forwards your mail to your workstation when you’re ready to read it.

25. VOIPVOIP VoIP allows you to make telephone calls using the Internet. Voice communication among the computers, free of charge Calls to phone numbers for a fee

27. Streaming Media n n Streaming media technology enables you to include audio, video and other multimedia files into your web site.

28. Downloading vs Streaming n n Downloading :The user downloads the file from the web server to her local hard disk, and then plays back the content using a player. n n Streaming: The media Server sends data over the network only at the speed that is necessary for the client to render it properly and allows live content delivery.

29. More Internet Applications n. n FTP is a standard network protocol used to exchange and manipulate files over the Internet.network protocolInternet n Instant Messaging, originally a real-time communication via the Internet using typed text and now includes voice and video