Terminology
An application programming interface (API): programming a predefined collection of components, applications can use to access the rest of the operating system.
File Services: fulfilling requests for read or write the storage medium a file on the network.
Print Services: fulfilling requests for print documents on the network.
Redirector: check local resource request is forwarded to the network as needed.
Sockets API: A network API, originally to provide applications on BSD UNIX TCP / IP interfaces and development.
Illustrating the principles of
First, the application layer in TCP / IP corresponds tothe application layer of the OSI model, the presentation layer, and session layer
Introduction of the respective layers of the OSI model as follows.
Application Layer: OSI application layer (not to be confused with the TCP / IP application layer) contains components provide services to user applications and support for network access.
Presentation Layer: The presentation layer data into a platform-independent format, encryption and data compression and processing.
Session Layer: manages communications between the networked computer applications, provides some transport layer is not provided, connection related functions, such as the name identification and security.
These services and applications to achieve is not essential. In the TCP / IP model, various implementations do not have to comply with these levels of OSI segment. But on the whole, of the OSI model application layer, presentation layer and session layer functions belong to the duties of TCP / IP application layer.
Second, the common TCP / IP tools
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