In the context of the OSI reference model, the application layer, Layer 7 of the OSI reference model, supports the communicating component of an application.
A computer application can require only information that resides on its computer. However, a network application might have a communicating component from one or more network applications.
A word processor might incorporate a file transfer component that allows a document to be transferred electronically over a network. This file transfer component qualifies the word processor as an application in the OSI context and belongs in Layer 7 of the OSI reference model.
Web browsers, such as Netscape Navigator and Internet Explorer, also have data transfer components. An example of this is when you go to a Web site-the Web pages are transferred to your computer.
Concept Questions
Demonstrate your knowledge of these concepts by answering the following questions in the space provided.
The application layer (Layer 7) provides services to application processes that are outside of the OSI model. What services are provided?
The application layer identifies and establishes the availability of intended communication partners and the resources required to connect with them. What are these resources?