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1 analysis
"In conceptual design, the breaking down and examination of business and user information into use cases and scenarios documenting work processes. In logical design, the identification of services, objects, attributes, and relationships from scenarios. In physical design, the examination of physical constraints of the infrastructure and the physical requirements of the application to select candidate implementation technologies and to draft a preliminary deployment model." -
2 OSI
"A networking model introduced by the International Organization for Standardization (ISO) to promote multi-vendor interoperability. OSI is a seven-layered conceptual model consisting of the application, presentation, session, transport, network, data-link, and physical layers." -
3 data-link layer
"Layer two of the OSI model. A layer that packages raw bits from the physical layer into frames (logical, structured packets for data). This layer is responsible for transferring frames from one computer to another, without errors. After sending a frame, the data-link layer waits for an acknowledgment from the receiving computer." -
4 network layer
"Layer three of the OSI model. A layer that addresses messages and translates logical addresses and names into physical addresses. It also determines the route from the source to the destination computer and manages traffic problems, such as switching, routing, and controlling the congestion of data packets."
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