data communication

DATA COMMUNICATION : 

DATA COMMUNICATION Presented By: Kapil Dev Pathak

Slide 2: 

Computer network: Networking is the practice of linking computing devices together with hardware and software that supports data communications across these devices.

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WAN MAN LAN

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LAN: Supplies networking capability to a group of computers in close proximity to each other such as in an office building, a school, or a home. It is known as Local Area Network.

MAN(metropolitan area network) : 

MAN(metropolitan area network) a network spanning a physical area larger than a LAN but smaller than a WAN, such as a city. A MAN is typically owned an operated by a single entity such as a government body or large corporation.

WAN(wide area network) : 

WAN(wide area network) A WAN is a geographically-dispersed collection of LANs. A network device called a router connects LANs to a WAN. In IP networking, the router maintains both a LAN address and a WAN address.

Advantages: : 

Advantages: File sharing Multi-player games Internet telephone service

Disadvantages : 

Disadvantages Cabling can be expensive to install and replace. A fault with the server will prevent the whole network from working. Security measures are needed to restrict access to the network. WANs are vulnerable to hackers and viruses

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Network topology is the physical interconnections of the elements (links, nodes, etc.) of a computer network. There are four principal topologies used in LANs. bus topology: All devices are connected to a central cable, called the bus or backbone. Bus networks are relatively inexpensive and easy to install for small networks. Ethernet systems use a bus topology.

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RING TOPOLOGY: All devices are connected to one another in the shape of a closed loop, so that each device is connected directly to two other devices, one on either side of it. Ring topologies are relatively expensive and difficult to install, but they offer high bandwidth and can span large distances.

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STAR TOPOLOGY: All devices are connected to a central hub. Star networks are relatively easy to install and manage, but bottlenecks can occur because all data must pass through the hub.

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TREE TOPOLOGY: A tree topology combines characteristics of linear bus and star topologies. A Tree Structure suits best when the network is widely spread and vastly divided into many branches.