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1 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." -
2 transport layer
"Layer four of the OSI model. The network layer that handles error recognition and recovery. When necessary, it repackages long messages into small packets for transmission and, at the receiving end, rebuilds packets into the original message. The receiving transport layer also sends receipt acknowledgments." -
3 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." -
4 network interface layer
A layer of the TCP/IP DARPA model that is responsible for placing TCP/IP packets on the network medium and receiving TCP/IP packets off the network medium. The network interface layer is also called the network access layer. -
5 application model
"Within a single application layer, a model that includes a specific set of developer elements such as classes, tables, and forms." -
6 bridge
"Software or hardware that connects two or more networks so that they can communicate, and that operates at the data-link layer (layer 2) of the OSI model." -
7 HDLC
"A protocol for information transfer adopted by the ISO. HDLC is a bit-oriented, synchronous protocol that applies to the data-link (message-packaging) layer (layer 2 of the ISO/OSI reference model) for computer-to-microcomputer communications." -
8 network bridge
"Software or hardware that connects two or more networks so that they can communicate, and that operates at the data-link layer (layer 2) of the OSI model."
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