Types of network

TYPES OF NETWOKS

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 transmissionmedia

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

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