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Types of network
 

Types of network

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    Types of network Types of network Presentation Transcript

    • Topics  What is network ?  Types of networks • LAN (Local Area Network) • MAN (Metropolitan Area Network) • WAN (Wide Area Network)  Comparison between the three networks.
    • NETWORKS What is a network?  Collection of computers and devices connected via communications devices and transmission media  Networks can be classified by the geographical area they cover
    • There are 3 types of computer networks    LAN (Local Area Networks) MAN (Metropolitan Area Network) WAN(Wide Area Network)
    • TYPES OF NETWORKS What is a local area network (LAN)?  Network in limited geographical area such as home or office building  LAN covers a small region of space typically a single building, schools or at home
    •  LAN can pass data to one and all as well as can share resources.  Once PC’s are physically connected, software designed specifically for LAN allows the exchange of program and data files among users connected to the network.  The network software allows any user to access shared data storage(hardware) and output devices (printers) connected to networks.  A group of computers and other devices dispersed over a relatively limited area say within a building and connected by a communication link that enables each device to interact with any other device on the network is called LAN.
    • Advantages of LAN  LAN allow sharing of expensive resources such as laser printers and high-capacity , high speed mass storage devices among a number of users.  LAN allows high speed exchange of essential information between key people in an organization. If properly managed, this will provide greater efficiency and productivity.  Through LAN, one can store all critical data at a central place and many users can then access and work on this data.  Since data can be stored centrally, you can take the back-up of all important files daily on tapes or hard disk drives,
    • Disadvantages of LAN  LAN software requires memory space in each of the computers used on the network. About 20% of the computer’s memory will be needed to manage the network interface. This reduces the memory space available for user’s programs.  LAN adds another level of complexity to the computer operation. Users may have difficulty in learning the network commands.  Some control on the part of a user is lost. For example , suppose you have to share a printer with other users, then you can face a situation where the entire network suddenly locking up because one user has made a mistake.
    • Disadvantages of LAN  LAN has security problems. Some types of security system must be implemented for protecting data. Any user can play foul and destroy the centrally stored data easily on a network.
    • Example on LAN: Two or more computers connected in a building or small office or a internet café.
    • TYPES OF NETWORKS Metropolitan area network(MAN) •MAN is a data network intended to serve an area approximately that of a large city. •Such networks are being implemented by techniques like running fibre cables through subway tunnels and satellites. •Popular example of MAN is SDBS(Switched Multimegabit Data Service).
    • Example of MAN:  Popular example of MAN is SDBS(Switched Multimegabit Data Service).  SDBS is a high-speed, packet-switched, datagram-based WAN networking technology used for communication over public data networks(PDNs). SMDS can use fiber- or copper-based media; it supports speeds of 1.544 Mbps.
    • TYPES OF NETWORKS What is a wide area network (WAN)?  Network that covers large geographic area using many types of media Internet is world’s largest WAN  Can be a collection of LANs or WANs or the mix of two with a very large geographical area for instant a country or even beyond the border  Dedicated transoceanic cabling or satellite uplinks may be used to connect this type of network. 
    • Wide Area Network (WAN)
    • Comparison between the three types of computer networks
    • Any Queries ?