To first understand Networking and communication, we have know what Data means. Data is defined in Data Communications and Networking as the information presented in whatever form is agreed upon by the parties creating and using the data. So, communication of data is the exchange of it between two ends, this can be through a type of transmission medium, like for example wire cable. Data communication can’t take place without the presence of group of things. One is the hardware, which is the physical part, and second is the programs, which are software, those two components are known as the communication system. To measure the effectiveness of that communication there are four things to look for:
1- Delivery: Which means that the right recipient should receive the right data, any mistake makes that data communication ineffective.
2- Accuracy: The data that is being delivered should be delivered accurately, which means no changes have to occur during the communication process.
3- Timeliness: Time in data communication is crucial. Any data that is being delivered late is considered to be useless.
4- Jitter: this refers to “the variation in the packet arrival time.”
Data Communication system
Data Communication system is formed by a set of five components:
1- Message: it is the message (data) that is needed to be delivered. This can be a text, audio, media, or numbers.
2- Sender: it is the device the message is being sent from, it could be a mobile phone, a computer, workstation, camera, etc.…
3- Receiver: it is the target or the aim where trying to reach, the receiver can be a computer, television, radio, and so on.
4- The medium: The transmission medium is the physical path which the data travels through.
5- Protocol: “is the set of rules that govern data communication. It represents and agreement between the communication device. Without a protocol, two devices may be connected but not communicating, just as a person speaking French cannot be understood by a person who speaks only Japanese.”
1- What is exactly a protocol?
2- How does some protocols like Https protect information ?
3- What other types of protocol and what is their function ?