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Networking Case Study

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Kotak Mahindra Bank has in all 34 centers in Mumbai. Its main branch (head office) is in Wadala. The center has 20 computers, named from A to T and have multiple laser printers which are shared by all the computers. These are called as nodes, i.e.linking devices. It also has a TMS (Token Machine System).
Connecting devices used are switches and routers.Switches are used because a hub has only 8 ports and if a system wants to connect more than 8 devices to a hub, a hub becomes inefficient. So a switch is used to connect a number of devices, which is then connected to one of the port of a hub, so that the rest of the ports of the hub remain free.

DATA TRANSMISSION :
The transmission of binary data across a link is accomplished in serial mode. Serial Data Transmission : In serial data transmission one bit follows another , so we need only one communication channel rather than ‘n’ to transmit data between two communicating devices. The advantage of serial data transmission is that with only one communication channel, serial transmission reduces the cost of transmission over parallel by roughly a factor of ‘n’. In serial mode, one bit is sent with each clock pulse.

Topology used
In this centre, a star topology is used. Because, itis less expensive, requires less cabeling and easyto install and reconfigure.
STAR TOPOLOGY : In a star topology, each device has a dedicated point to point link only to a central controller , usually called a‘hub’. The devices are not directly linked to each other. A star topology does not allow direct traffic between devices. The controller acts as an exchange. If one device wants to send data to another, it sends the data to the controller, which then relays the data to the other connected device. A star topology is less expensive. In a star topology, each device needs only one link and one I/O port to connect it to any number of

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