Definition - What does Computer Network mean?
A computer network is a group of computer systems and other computing hardware devices that are connected together through communication device and transmission media.
| COMMUNICATION DEVICE | TRANSMISSION MEDIA |
|---|---|
| network card | infrared |
| wireless access point | broadcast radio (bluetooth) |
| dial-up modem | cellular radio (2G,3G,4G) |
| digital modem (ISDN,DSL,Cable Modem) | microwave |
| wireless modem | communication satellite |
| router | |
| switch | |
| hub |
ADVANTAGES AND DISADVANTAGES OF NETWORK
Advantages
- sharing hardware which it can reduce the cost of purchasing hardware
-sharing software which it can reduce the cost of buying software
-sharing transferring files within networks is very rapid
-sensitive files and programs on a network can be password protected
Disadvantages
-breakdowns and possible loss of resources means that we may loss the important data
-expensive to buy and replace cables and other hardware
-security threats there are hackers who are trying to steal valuable data
-heavy users who consume a lot more bandwidth will affect other users
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