OSI_Model

OSI Model 1.) Compare the OSI reference model and the TCP/IP suite of protocols and state their differences. OSI divides telecommunication into seven layers. The layers are in two groups. The upper four layers are used whenever a message passes from or to a user. The lower three layers (up to the network layer) are used when any message passes through the host computer. Messages intended for this computer pass to the upper layers. Messages destined for some other host are not passed up to the upper layers but are forwarded to another host. The seven layers are: Layer 7: The application layer...This is the layer at which communication partners are identified, quality of service is identified, user authentication and privacy are considered, and any constraints on data syntax are identified. (This layer is not the application itself, although some applications may perform application layer functions.) Layer 6: The presentation layer...This is a layer, usually part of an operating system, that converts incoming and outgoing data from one presentation format to another (for example, from a text stream into a popup window with the newly arrived text). Sometimes called the syntax layer. Layer 5: The session layer...This layer sets up, coordinates, and terminates conversations, layer, network, layers, protocol, application, model, data, access, transport, osi, layerthis, protocols, tcp/ip, provides, physical, control, udp, transfer, tcp, suite, snmp, session, internet, user, upper, two, transmissions, transmission, through, text, seven, service, routing, presentation, level