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Additional info for Advanced Network Programming - Principles and Techniques
The Network layer is mainly in charge of routing packets through sub-nets. • The Transport layer offers end-to-end data communication services to upper layers. • The Session layer allows users to establish sessions between them, each session offering services such as dialog control and synchronization. • The Presentation layer is concerned with the syntax and semantics of the information (data) exchanged. • The Application layer contains a variety of protocols specific to user applications. Unlike OSI, the TCP/IP reference model has only four layers: Host-to-Network, Internet, Transport, and Application.
HTTP is standardized in RFC 1945 and RFC 2616, and works in general on top of TCP. HTTP uses in general port 80, but other ports can be used as well. 0) or multiple simultaneous connections (HTTP v. 1) initiated by the client to the server. Client sends commands and server responds with command status messages. In general, each session involves at least one request response. Web pages or documents can be classified into three categories: Static, Active, and Dynamic. Static documents are identically delivered at every request and to any user.
These sub-layers are the Device Driver and Network Adapter sub-layers. The Network Adapter layer corresponds to the physical layer of the OSI reference model and mainly consists of the hardware implementation of network interfaces. The Device Driver layer contains two sub-layers, namely the Logical Link Control and the Medium Access Control. The Logical Link Control (LLC) offers the upper layers and the operating system access to the device driver. The Medium Access Control (MAC) is responsible for reporting and setting the device status, package outgoing data received from LLC in the format required by the network adapter, sending outgoing data at the appropriate time, receiving incoming data and unpacking it before verifying its integrity, and delivering it to the LLC sub-layer.