What is the responsibilities of Application layer protocol?

Problem is:

What is the responsibilities/principles of Application layer protocol?

Solution is:

Application Layer
The application layer is where network applications and their application-layer protocols reside.
The Internet’s application layer includes many protocols, such as the

1. HTTP protocol (which provides for Web document request and transfer), 
2. SMTP (which provides for the transfer of e-mail messages) and 
3. FTP (which provides for the transfer of files between two end systems). 

We’ll see that certain network functions, such as the translation of human-friendly names for Internet end systems like ww.test.com to a 32-bit network address, are also done with the help of a specific application-layer protocol, namely, the domain name system (DNS).

It is very easy to create and deploy our own new application-layer protocols. An application-layer protocol is distributed over multiple end systems, with the application in one end system using the protocol to exchange packets of information with the application in another end system. This packet of information at the application layer will be called as a message.



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