The Basics Of Data Communication And Computer Networks admin 2020-10-10 Technology Children learn to speak in a verbal or a non-verbal way to communicate with people around them. To use the computers and to understand them, we need to understand their networking and communication process. What Is computer Networks? Computer Network is a collection of hardware devices and systems linked together through channels to facilitate resource sharing and communication. Use Of Computer Network: It helps in sharing resources from one system to another. It helps in remote access of files connected to a network. It allows using the printer or scanner connected to one computer to be used by all the other computers on the same network. The Parameters That Define Communication: Four parameters evaluate the effectiveness of the communication system: Delivery: The system sending any data should deliver it to the right destination. The data received by the intended device or user display the effectiveness of communication. Accuracy: The data delivered should be accurate and stable without noise interference. Timelines: The data delivery on time is the mark of an effective system. Data that is received late is useless. Jitter: While watching a video, sometimes the video lags while the audio plays on time. This uneven delay in delivery is called jitter. Components Of Data Communication: There are five components: Message: It is the data that transfer from one device to another. Sender: The device sending the message. Receiver: the device receiving the message. Medium: The physical path through which the transmission takes place. Protocol: They are the set of guidelines and rules under which the communication process takes place. It also includes creating and implementing policies for the recovery of data. The Various Modes Of Data Communications: Modes of data communication mean how the message communicates from one device to another: Simplex: It is a unidirectional communication flow. Under simplex, only one device can send the message while the other only receives it, for Example, Keyboard. Half Duplex: It is a bi-directional flow of data. Under this, both the devices can send or receive but only one at a time, for example, a walkie-talkie. Full Duplex: It is also a bi-directional data flow, and in this, both the devices can send and receive data, for example, a telephonic line. The Criteria For Networks: Any network that one uses should be able to meet these criteria: Performance: Metric measure for this is time. Reliability: It is measured based on the number of times the network failed. Security: This includes protection of data from attack, damage Types Of Connections: There are two types of connections in a network. Firstly, the point-to-point. In this, there is a link between only two devices. The link is a transmission link between only these two devices. For example, when we change the channel of a tv using an infrared remote control. Secondly, the multipoint in this more than two devices share the link established. Topologies And It’s Types: Topology is how computers are connected physically in a network. Based on the requirement, one can choose the kind of network topology they prefer. There are five types of topologies: Mesh, Bus, Star, Ring, and Hybrid. Takeaway: Computer networking is the basis of understanding the computer’s working and operations before diving into the deeper world.