Describe Communications At The Application Level - Give An Example.

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Describe Communications At The Application Level - Give An Example.

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Each client and server application installed on a computer listens at a predetermined address that uniquely identifies the application on the computer. This address is a number and is called a port number, port, or port address. For example, you can address a web server by entering into a browser address box an IP address followed by a colon and then the port number. These values are known as a socket. For example, an email server waiting to send email to a client listens at port 25, and a web server listens at port 80. Suppose a computer with an IP address of 136.60.30.5 is running both an email server and a web server application. If a client computer sends a request to 136.60.30.5:25, the email server that is listening at that port responds. On the other hand, if a request is sent to 136.60.30.5:80, the web server listening at port 80 responds.
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