COMPUTER NETWORKS

Network is a connection of two or more devices for the purpose of exchanging signal or communication. Computer network is the network where by two or more computers have been connected for the purpose of exchanging data and sharing resources such as Printers, Scanners, CD-ROM s, exchange files, or allow electronic communications. The computers on a network may be linked through cables, telephone lines, radio waves, satellites, or infrared light beams. What are communication networks and what advantages do they offer? A network, or a communication network , is a system of interconnected computers, telephones, or other communication devices that can communicate with one another and share applications and data. It is the tying together of so many communication devices in so many ways that is changing the world we live in. A network requires various devices, and a network operating software.

ADVANTAGES OF COMPUTER NETWORKS
-Sharing of resources Allows sharing of resources such printers, disk storage, scanners, modems and central serves Faster data sharing
-Transferring files across a network is always faster than other non-network means of data transfer.
-Efficient communication Electronic mail, project monitoring, on-line conferencing, etc, can lead to better communication between workgroups and help improve productivity
-Keeping information reliable and up-to-date
-A well managed, centralized data storage system allows multiple users from different locations to access data and limits the access to data when it is being processed.
-It saves cost-as application programs can only be installed in central computer and shared by all other connected computers.  

DISADVANTAGES OF COMPUTER NETWORKS
-If the central computer shared by other networked computer fail, all other users will be unable to run applications programs
-If the operating system of the network stops, hardware and software resources cannot be accessed.
-Unless properly designed, as traffic on the network increases, network performance degrades.
-Network require high skilled system or network administrator for management of it, otherwise it cannot operate efficiently.  

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