TCP/IP Architecture
There are four levels to understanding how Java applications communicate over the network using TCP. Figure 23.1 shows these levels in their simplest form.
Figure 23.1. The TCP/IP network model can be broken down into four layers.
When viewed as a layered model, TCP/IP is usually seen as being composed of four layers, each playing a specific role:
Application Layer— The Application Layer enables network applications to communicate clearly. In a client/server system, the client application knows how to request services, and the server knows how to appropriately respond. Protocols that implement this layer include HTTP, FTP, ...
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