Author: Neftaly Malatjie

  • 114061 LG 1.27 Network Interface Card

    Network adapter is a device that enables a computer to talk with other computer/network. Using unique hardware addresses (MAC address) encoded on the card chip, the data-link protocol employs these addresses to discover other systems on the network so that it can transfer data to the right destination.

    There are two types of network cardswired and wireless. The wired NIC uses cables and connectors as a medium to transfer data, whereas in the wireless card, the connection is made using antenna that employs radio wave technology. All modern laptop computers incorporated wireless NIC in addition to the wired adapter

  • 114061 LG 1.26 CATEGORIES OF NETWORK COMPONENTS

    Computer network requires the following devices (some of them are optional):-

    • Network Interface Card (NIC)
    • Hub
    • Switches
    • Cables and connectors
    • Router
    • Modem
  • 114061 LG 1.25 METHOD OF WAN IMPLEMENTATION

    A Wide Area Network (WAN) is a computer set of connections that helps link multiple distance districts that may extend across the globe. WANs generally help connecting numerous smaller networks, for example local area networks (LANs) or metro area networks (MANs). The most prevalent WAN all over the world is the Internet. Several fragments of the Internet can also function with due similarity to WANs. The chief variation amid WAN and LAN expertise is scalability. WAN is expected to be stretched because the requirement to cover multiple cities, even countries and continents, is a must.

    A group of switches and routers are interrelated to structure a Wide Area Network. The switches can be attached in diverse localities like complete network and partial networks as well. A wide area network can be confidentially possessed or hired from a service provider, but the fact cannot be ignored that it covers multiple servers.

    Packet switching and circuit switching equipment’s are employed in the WAN. Packet switching permits consumer to distribute widespread carrier supplies so that the haulier can construct additional proficient utilization of its communications. In a packet switching unit, networks have associations into the network of the carrier, and numerous clients split the set of connections of the carrier. The carrier can then generate effective circuits among sites of the customers, by which packets of data are distributed from one to the other, all the way through the network.

    Circuit Switching allow the data connections to be ascertained when required and then concluded when transmission is widespread. These acts like a normal telephone line work for voice correspondence. Integrated Services Digital Network (ISDN) is a fine illustration of circuit switching. When a router has information for a remote site, the switched circuit is commenced with the circuit amount of the remote arrangement of the entire network.

    Abundant WANs have been assembled, together with communal packet networks, great corporate networks, armed networks, depository networks, stock brokerage networks and airline reservation networks.

    Some WANs are immensely widespread across the globe, but the majority do not supply accurate worldwide exposure in terms of coverage and connection.

    The features of the communication amenities direct to an importance and prominence on competence of communications techniques in the devised plans of WANs. Overbearing the quantity of traffic and evading extreme hold-ups are important. A lot of WANs also put into practice complicated administrating measures to report as to which consumer incinerates the network resources. This is utilized to produce billing information to price the use and expenditure of individual consumers.

    Conduction rate recurrently extended from 1200 bps to 6 Mbps; even though a few connections like ATM and Leased lines can be utilized at speeds advanced as compared 156 Mbps. Standard communication contacts engaged in WANs are telephone lines, microwave links and satellite network. Network protocols collectively with TCP/IP put across or transmit transfer and dispatch presentation. Protocols comprising of Packet over SONET/SDH, MPLS, ATM and Frame relay are commonly employed by provision suppliers to deliver the connections that are utilized in WANs.


  • 114061 LG 1.24 SESSION 2: EVALUATING WAN

    On completion of this section you will be able to evaluate a wide area computer network (WAN). 

    1. The evaluation identifies the method of implementation of the WAN. 
    2. The evaluation distinguishes categories of the network components, their functions & examples. 
    3. The evaluation identifies and explains features and constraints of the network from a functional perspective. 
    4. The evaluation assesses the suitability of the network for its use. 

    The evaluation proposes and compares alternative network designs

  • 114061 LG 1. 23 Fibre Optic Cable

    Unlike twisted pair cable and coaxial cable with wires inside, fiber optic cable consists of a bundle of glass threads, each of which is capable of transmitting message modulated onto light waves. There exist various types of fiber optic cables, which are determined by the number of fibers and where it will be installed. Currently, two types of fiber optic cables are widely adopted in the field of data transfer—single-mode fiber optic cable and multimode fiber optic cable. A single-mode fiber optic cable has a small fiber core and only allows one mode of light to pave through at a time, so it is available for high-speed and long-haul applications. By contrast, a multimode fiber optic cable has a much bigger fiber core and it can carry multiple light rays at a time, so it is more ideal for short distance data transmission. The following table shows some differences between single-mode and multimode fiber optic cables.

    Pros: Compared to the above mentioned copper cables, fiber optic cable takes more advantages, such as lighter, better performance and higher bandwidth. But the biggest advantage of fiber optic cable is that it can transmit much more data with the lowest loss at higher speed for longer distance.

    Cons: Nevertheless, it needs complicated installing skills, and much more expensive than copper cables.