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Network Notes

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Network Notes

  1. 1. Deborah Dotson September 12, 2010
  2. 2. Is this what you think of when you hear the word “network”?
  3. 3. Or maybe this type of “Network”?
  4. 4. Glossary Networks Infrastructure Switches Devices Protocol Hardware Topology Routers Internet OSI
  5. 5. A simple explanation is that a Network is two computers connected to share information, but of course we know it is often much more. All networks start from this basic concept. Any device connected to the network is called a “network device”. When several devices are connected, they need a “hub”. When many devices are connected they need routers and switches to handle the communication. Each device is given an “address” usually called an “IP” address. This is a numerical label. The IP Address serves two functions -host or network interface identification and location addressing Here are four computers connected:
  6. 6. When considering a Network, you probably think about the Internet…. Definitions of internet on the Web: •A computer network consisting of a worldwide network of computer networks that use the TCP/IP network protocols to facilitate data transmission and exchange •The Internet is a global system of interconnected computer networks that use the standard Internet Protocol Suite (TCP/IP) to serve billions of users worldwide. ... •Any set of computer networks that communicate using the Internet Protocol. (An intranet.); The Internet, the largest global internet •Often confused with the World Wide Web, the term Internet actually refers to the combined collection of academic, commercial, and government networks connected over international telecommunication backbones and routed using IP addressing.
  7. 7. A more in depth explanation of determining the scope of a Network involves the following:  Size  Protocol  Topography  Hardware  Cabling/Infrastucture
  8. 8.  Size - there are several types of networks, but the most common are LANS and WANS. A Local Area Network (LAN) covers a small physical area, like a home, office, or small groups of buildings, such as a school. Some of the characteristics of LANS are their higher data-transfer rates, smaller geographic area, and they don’t need to lease telecommunication lines. A Wide Area Network (WAN) is used to connect a LAN and other types of networks together. The purpose of this so that the computers in one place can communicate with computers in other locations. For example in your school district they probably have a private WAN, but may have another to provide a connection to the Internet.
  9. 9. What is Protocol? Rules about appearance, speaking, listening and understanding are considered the protocols of conversation. They represent different layers of communication and together they help people communicate successfully. Protocols also apply to computers. Network engineers have written rules for communication that must be strictly followed for successful host-to-host communication. )
  10. 10. Protocols are often called the Open System Interconnection or “OSI Model” and they help define the implementation of a networking framework
  11. 11. Topography is the “backbone” of a network and the “map” of how the communication between devices will flow Types of Topography
  12. 12.  Hardware - Computer networks normally consists of three parts:  Clients: The user workstations and peripherals (such as printers)  Infrastructure/Cables -The wires, fiber optics, or transmission media that the data moves through  Networking electronics: Devices that move, route, and store data for users
  13. 13. These devices act like an Air Traffic Control Tower and the Controllers themselves – they get the data and transmit the data and make sure that everything gets to it’s destination in a timely and safe manner. Switch Routers Hub
  14. 14. Cables – these are used transmit data in the network
  15. 15. Examples of Networks and the “topography” of their Communication between devices – this may be how your network works…..
  16. 16. Computer networks can be used for several purposes:  Facilitating communications. Using a network, people can communicate efficiently and easily via email, instant messaging, chat rooms, telephone, video telephone calls, and video conferencing.  Sharing hardware. In a networked environment, each computer on a network may access and use hardware resources on the network, such as printing a document on a shared network printer.  Sharing files, data, and information. In a network environment, authorized user may access data and information stored on other computers on the network. The capability of providing access to data and information on shared storage devices is an important feature of many networks.  Sharing software. Users connected to a network may run application programs on remote computers.
  17. 17. References,295582,sid7_gci1166812,00.html nfrastructur_topologies.pdf
  18. 18. Picture References Page 2 - network1.jpg Page 6 Pictures of Computers Page 8 Page 13 Switch Box Cisco Routers - Netgear Hub Page 14 pictures of blue cables - Ethernet cables - content/uploads/2008/12/cabling.jpg Little Guy - Page 15 Basic Network pic Large Network