Computer Network
• A collection of computers and other hardware devices that are connected together to share hardware, software, and data as well as to communicate with one another
Network Classification
• WAN - Wide Area Network
• MAN - Metropolitan Area Network
• PAN
• W….......
TRANSMISSION MEDIA
Bounded/guided (WIRED)-Twisted pair
-Coaxial
-Fibre optics
Unbounded/Unguided (air/vacuum) (WIRELESS)
-Satellite communication
-Microwave radio
-Infrared signals
NETWORK ELECTRONIC DEVICES
Router
Switch
Bridge
Gateway
SOFTWARE
• Network software is used to efficiently share information among computers
– At the nodes : involve techniques and protocols to
determine rules and procedure to transmit ,
terminate, translate and to present data and also to
control errors.
– to ensure data reach the destinations
Software for the server Software for client
A network (=server) operating system (NOS)
– a piece of software that controls a network
and its message traffic and queues, controls access by multiple users to network resources such as files, and provides for certain administrative functions, including security.
– Installed on the server client software
– Installed on the PC/cmputers to access the network and to issue requests to the network
NETWORK ARCHITECTURE
STANDARDS
• Architecture: blueprint of standards for a network consisting of items such as choice of media, media interfaces, encoding methods, transmission protocols, routing protocols, etc.• Needed to ensure interoperability between various devices and equipment made by different vendors.
Uses of Computer Networks
- Sharing application software with network license, which is cheaper, installed and updated on one computer only
- Working collaboratively
- sharing database
- Exchanging files
Networks devices : Local Area
• Media (Network cable)
• Hub/Repeaters
• Server
• Workstations
• NOS (Network operating
Software)-server
• NCS (Network Client Software)
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