DATA FLOW:
Data communication between two devices can be simplex, half-duplex and full-duplex
Simplex:
In simplex mode the data communication will take place in one direction or unidirectional, only one device can transmit and other device will only receive the data. Some of the example of simplex mode is keyboard and monitor, in these the keyboard will transmit and monitor will accept it.
Half-duplex:
Where in half-duplex mode one station can transmit and other receive it and vice versa. In these mode both devices can transmit and receive but not at the same time. Walkie-talkie is an example of half duple mode.
Full duplex:
In a full-duplex mode, both the station can transmit and receive at the same time. It looks like two- way traffic road which allows the traffic in both the directions. One of the most common examples in full-duplex is the telephone line.
Network:
Network may be a set of nodes connected by communication links. While a device may be a computer, printer or other devices which has the capability of sending and receiving data generated by other devices on the network.
Network must meet some important criteria which may include performance, reliability and security.
Performance:
Performance may be defined as measuring of transmit time and response time. Transmit time is defined as amount of time required for a message to travel from one device to another device. Response time will be defined as the elapsed time between an inquiry and a response.
Reliability:
Accurately delivery of data is defined in terms of reliability which is measured from the frequency failures.
Security:
Security is defined as protecting data from unauthorized access and from damage. Security can be provided to a network by using some rules and procedures.
Types of connection:
Network is defined as the combination of two or more devices connected via a physical path. A physical path is a link between two devices which transfer data from one device to another device. There are two types of connections. They are;
Point-to-point:
Point-to-point connection provides dedicated path between two devices, in these the entire capacity is reserved only between those two devices.
Multipoint:
Multipoint connection is defined as more than one device share a specific path, in this the entire path is shared temporarily are permanently between those devices.
