23-02-2013, 03:18 PM
Computer Administration
Computer Administration.ppt (Size: 916 KB / Downloads: 192)
Computer Network - Basic Concepts
Computer Networks
Communication Model
Transmission Modes
Communication Types
Classification Of Computer Networks
By Scale
By Structure
By Topology
Network Media
Internetworking
Communication Model
Source
generates data to be transmitted
Transmitter
Converts data into transmittable signals
Transmission System
Carries data
Receiver
Converts received signal into data
Destination
Takes incoming data
Transmission Modes
Simplex
One direction
e.g. Television
Half duplex
Either direction, but only one way at a time
e.g. police radio
Full duplex
Both directions at the same time
e.g. telephone
Local Area Network
Contains printers, servers and computers
Systems are close to each other
Contained in one office or building
Organizations often have several LANS