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NETWORK (DISADVANTAGES (Additional load on computer because of resource…
NETWORK
DISADVANTAGES
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There is a danger of hacking, particularly with wide area networks
If something goes wrong with the file server,the whole network is unable to operate
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COMMUNICATION DEVICES
Modem
The name modem means modulator demodulator.A modem is a communications device that can convert analog signals to digital signals and digital signals to analog signals.
Router
Connects multiple computers or other router together and transmits data to its correct destination on a network
Network Card
-Enables a computer or device to access a network
-Network card also available in a variety of styles
-Wireless network cards often have an antenna
Hub/Switch
A devices that provides a central point for cables in a network and connects several devices in a network together
Wireless Access Point
A central communication device that allows computers and devices to transfer data wirelessly among themselves or to transfer data wirelessly to a wired network.
-Dial-Up Modem
-Digital Modem : Cable modem, DSL modem, ISDN modem
TRANSMISSION MEDIA
Physical
Use wire,cable and other tangible materials to send communication signals
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Wireless
Cellular Radio
A form of broadcast radio that is used widely for mobile communications,specifically wireless modems and cell phones
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Communication Satellite
A spacestation that receives microwave signals from an earth-based station,amplifies it,and broadcast the signal over a wide area to any number of earth-based station
Broadcast Radio
A wireless transmission medium that distributes radio signals through the air over the long distances such as between cities,regions and countries and short distances such as within an office or home
Infrared (IR)
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Example: Mouse,printer and smart phone, often have an IrDA port that enables the transfer of data from one device to another devices.
DEFINITION
A collection of other devices and computers connected together via communication devices and transmission media.