Application layer protocols provide services for user applications from "summary" of Data Communications and Networking by Behrouz A. Forouzan
Application layer protocols play a crucial role in data communications by providing services for user applications. These protocols are responsible for enabling communication between different applications running on separate devices. When a user interacts with an application, such as a web browser or email client, the application layer protocols kick in to ensure that the communication between the user and the application is smooth and seamless. One key characteristic of application layer protocols is that they are designed to be user-friendly. They abstract all the complex networking details and provide a simple interface for users to interact with the application. This allows users to focus on their tasks without having to worry about the underlying networking infrastructure. For example, when you send an email using a mail client, you don't need to know how the email is actually transmitted over the network - the application layer protocol takes care of all the details for you. Another important aspect of applic...
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