Data Communications Course And Certification

What is Data Communications?

Data Communications refers to the transmission of digital data between two or more computers. A computer network or data network is a telecommunications network that allows computers to exchange data. The physical connection between networked computing devices is established using either cables media or wireless media. The best-known computer network is the Internet. 

Data Communications are said to be local if communicating devices are in the same building or in a similarly restricted geographical area. 

A Data Communication system can collect data from remote locations through data transmission circuits, and then output processed results to remote locations. The different data communication techniques which are presently in widespread use, evolved gradually, either to improve the data communications techniques already existing or to replace the same with better options and features. 

What is Communication? 

Communication is the process of sharing a message. A conversation between two people is an example of communication. 

Characteristics Of Data Communications:

The performance of a Data Communications system depends on four fundamental characteristics:

1. Delivery: The data must be delivered in the correct order to the correct destination.
2. Accuracy: The data must be delivered accurately.
3. Timeliness: The Delivered data must be timely because data delivered late is useless.
4. Jitter: It is the uneven delay in the packet arrival time that causes uneven quality.

Features Of Data Communications

A Data Communication system has the following features:

1. Message: It is the information or data to be transmitted. It is made up of text, numbers, pictures, sound video, or any combination of these.
2. Sender: It is the device or computer that develops and sends that message.
3. Receiver: It is the device or computer that receives the message. The location of the receiving computer is generally different from the sender's computer. The distance between the sender and receiver depends upon the type of network used in between.
4. Medium: It is the channel or physical path in which the message is carried from the sender to the receiver.
5. Protocol: It is a set of rules that govern the communication between the devices. Both the sender and receiver follow the same protocols to communicate with each other.

Protocol Performance in Data Communication: 

A protocol performs the following functions: 

1. Data Sequencing: It refers to splitting a long message into smaller packets of fixed size. Data sequencing rules define the method of numbering packets to detect loss or duplication of packets and to correctly identify packets, which belong to the same message.
2. Data Routing: Data routing defines the most efficient path linking the source and destination.
3. Data Formatting: Data formatting rules define which group of bits or characters within the packet constitute data, control, addressing, or other information.
4. Flow Control: A communication protocol also prevents a fast sender from overwhelming a slow receiver. It ensures resource sharing and protection against traffic congestion by regulating the flow of data on communication lines.
5. Error Control: These rules are designed to detect errors in messages and to ensure the transmission of correct messages.
6. Precedence and Order of Transmission: These rules ensure that all the nodes get a chance to use the communication lines and other resources of the network based on the priorities assigned to them.
7. Connection Establishment and Termination: These rules define how connections are established, maintained and terminated when two nodes of a network want to communicate with each other.
8. Data Security: Providing data security and privacy is also built into most communication software packages. It prevents access to data by unauthorized users.
9. Log Information: Several communication software is designed to develop log information, which consists of all jobs and data communications tasks that have taken place. 

Benefits Of Data Communications

There are many benefits of Data communications some of them are: 

1. Data Communication allows us to relay information between two or more devices.

2. Data Communication makes the world a global village, which means that we are all connected to each other.

3. Data Communications make it easy for us to carry out mundane tasks that were hard to do before easily like messaging someone over a distance. 

4. Data Communications enables the movement of electronic or digital data between two or more nodes, regardless of geographical location, technological medium or data contents, emails and instant messages, as well as phone calls are examples of data communications. 

This course will teach you all about Data Communication including various concepts in Data Communication and Computer Networks. 

Data Communications Course Outline:

Data Communications - Introduction/Overview

Data Communications - Computer Network Types

Data Communications - Network LAN Technologies

Data Communications - Computer Network Topologies

Data Communications - Computer Network Models

Data Communications - Computer Network Security

Data Communications - Physical Layer 

Data Communications - Digital Transmission

Data Communications - Analog Transmission

Data Communications - Transmission media

Data Communications - Wireless Transmission

Data Communications - Multiplexing

Data Communications - Network Switching

Data Communications - Data Link Layer  

Data Communications - Error detection and Correction

Data Communications - Data Link Control & Protocols

Data Communications - Network Layer 

Data Communications - Network Addressing

Data Communications - Routing

Data Communications - InterNetworking

Data Communications - Network Layer Protocols

Data Communications - Transport Layer

Data Communications - Transmission Control Protocol

Data Communications - User Datagram Protocol

Data Communications - Application Layer  

Data Communications - Client-Server Model

Data Communications - Application Protocols

Data Communications - Network Services

Data Communications - Exams and Certification