Application level

The application layer refers to the interface methods used by communication protocols and hosts shared in the communication network. The application layer is used in standard modeling of computer networking: Internet Protocol Suite (TCP / IP) and OSI model. Although both models use the same term for their respective higher level levels, detailed definitions and purposes are different.

In TCP / IP, the application-level includes the Internet Protocol (IP) computer network communications protocols and interface methods used in process-to-process communication. The application layer only standardizes the communication and relies on the underlying transport layer protocols to establish host-to-host data transfer channels and to manage data exchange in a client-server or peer-to-peer networking model. However, the TCP / IP application layer does not describe specific rules or data formats, when applications should be considered while communicating, the original specification (in RFC1123) relies on and strongly recommends the strength of the application for the design of the app.

In the OSI model, the definition of the application layer is summarized in space. The OSI model defines the application layer as the user interface responsible for displaying the information received to the user. In contrast, the Internet Protocol Suite does not belong to itself with these details. OSI also separates the extra functionality below the application layer, but at two extra levels on the transport layer: the session layer and the presentation level. The OSI offers a steady modular performance of these functions on these levels and provides protocol implementation for each level.

Application Level Protocol
(Session Layer under OSI model) The IETF definition document for the application layer in the Internet Protocol Suite is RFC1123. It provides the initial set of protocols that cover the main aspects of the initial internet functionality.

Remote Access to Host: Telnet File Transfer: File Transfer Protocol (FTP), Trivial File Transfer Protocol (TFTP) Electronic Mail Transfer: Simple Mail Transfer Protocol (SMTP) Networking Support: Domain Name System (DNS)

Design pattern for application level protocol
Generation and implementation of communication protocols are commonly encountered problems that can be addressed by patterns from many different pattern languages: pattern language, service design patterns for application-level communication protocols, pattern of enterprise application architecture, and pattern-oriented software Architecture: Pattern Language for Distributed Computing

This pattern focuses on the formation of the first protocol in languages ​​and does not take into account its implementation. Other people either address both fields or just the next issues.

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