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It is a collection of processes that tells the sender how much data it can send before the data destroys the receiver. The receiving device has finite speed and limited memory to save the data.Thus, the receiving device should be able to instruct the sending device to stop the transmission temporarily before the limits are arrived.There is another essential problem in the data link design to manage the cost of data communication between two source and destination hosts. If the conflict between the source and destination hosts data sending and receiving speed, it will make packets drop at the receiver ... Read More
Data Link Control is the service provided by the Data Link Layer to offer reliable data transfer over the physical channel. It takes the physical layer’s bits and finds an error.This creates an error-free communications path among network nodes over the physical medium, frames messages for communication, tests the integrity of received messages, manages access to and uses the medium, ensures the proper sequence of transmitted data.Error ControlIt contains sequencing frames and transmitting control frames for acceptance. A noisy channel can avoid scanning of bits, falling bits from a frame, introducing specific bits in the frame, frames final sinking, etc.The ... Read More
DWDM represents Dense Wavelength Division Multiplexing. It is a technology in which several optical signals (laser light) of multiple wavelengths or colors are combined into one signal and are sent over the connecting channel to a lengthy area.When the optical signal transmission distance changes into thousands of kilometers, it results in loss of few signals. It can fascinate this signal loss, optical fibre amplifiers are used in the DWDM transmission system.The DWDM technology needed this gain bandwidth to share various optical signals together efficiently. DWDM can address up to 80 channels (80 optical signals) with 100 GHz (0.8 nm) spacing.Dense ... Read More
Let us begin by understanding what an antivirus is.AntivirusAntivirus software is a program that acts against virus protection. It can find or see the virus, and following, after finding the nearness of the virus, it works on expelling it from the computer system. Antivirus software works as a prophylactic with the aim that it takes out a virus and keeps some potential viruses from infecting your device in the future.Antivirus software is the important level of our internet security, be it on our personal computers or cellular devices. It is becoming essential to have trustworthy protection on our smartphones, because ... Read More
Computer Network is an interconnection of numerous computers to share an operating system, hardware, and information through a transmission mode among them. There is no condition to the location between two computers in a network.Elements of Computer NetworkA computer network involves the following elements −Nodes (Workstations) − The multiple terminals linked to the network sharing the network resources are known as nodes.Server − It can assign a specific node as a central node at a well-known and permanent address to support the network. The node supporting the service is referred to as the server.Network Interface Unit − The interpreter, which ... Read More
Let us understand the concept of electronic commerce.E-CommerceE-Commerce stands for Electronic Commerce. It defines buying and selling of goods, products, or services over the internet. E-commerce is also defined as electronic commerce or internet commerce.These services are supported online over the internet network. Transactions of money, funds, and data are also treated as E-commerce. These business transactions can be completed in four techniques such as Business to Business (B2B), Business to Customer (B2C), Customer to Customer (C2C), and Customer to Business (C2B).Advantages of E-CommerceThe advantages of E-Commerce are as follows −E-commerce supports sellers with a worldwide reach. It can eliminate ... Read More
Let us understand the concept of web conferencing.Web ConferencingWeb conferencing is a simple term for several kinds of technologies that enable two or more people from multiple areas to hold a live conference over the Internet. Web conferencing usually takes place over the web using TCP/IP connections.It was created as an enhanced audio bridge with images. It makes it possible to send presentations with audio participants placed around the globe, and its features, such as recording and presenter video, make it great for the dissemination of data from few to many. It can be used for smaller conferences, but it ... Read More
Postman POST request allows appending data to the endpoint. This is a method used to add information within the request body in the server. It is commonly utilized for passing delicate information.Once we send the request body via the POST method, the API, in turn, yields certain information to us in Response. Thus a POST request is always accompanied by a body in a proper format.Create a POST RequestStep1 − Click on the New menu from the Postman application. The Create New pop-up comes up. Then click on the Request link.Step2 − SAVE REQUEST pop-up comes up. Enter Request name ... Read More
Postman DELETE request deletes a resource already present in the server. The DELETE method sends a request to the server for deleting the request mentioned in the endpoint. Thus it is capable of updating data on the server.Before creating a DELETE request, we shall first send a GET request to the server on the endpoint http://dummy.restapiexample.com/api/v1/employees .On applying the GET method, the below Response Body is obtained.Let us delete the record of id 2 from the server.Create a DELETE RequestStep 1 − Click on the New menu from the Postman application. The Create New pop-up comes up. Then click on ... Read More
We can parameterize Postman requests to execute the same request with various sets of data. This is done with the help of variables along with parameters. A parameter is a part of the URL used to pass more information to the server.The data can be used in the form of a data file or an Environment variable. Parameterization is an important feature of Postman and helps to eliminate redundant tests. Parameters are enclosed in double curly braces {{parameter}}.Let us take an example of an URL:https://www.tutorialspoint.com/index.htm. We shall create a variable as URL then use it for parameterization of the request. ... Read More