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The OSI Reference Model / EXAM / 100% VERIFIED ANSWERS

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The top 3 layer of the OSI model - ANS -define how the applications within the end stations communicate with each other and with users. layer 7 Provides a user interface layer 6 Presents data Handles processing such as encryption layer 5 Keeps different applications'• data separate The bottom 4 layer of the OSI model - ANS -define how data is transmitted end to end layer 4 Provides reliable or unreliable delivery• Performs error correction before retransmit layer 3 Provides logical addressing,• which routers use for path determination layer 2 Combines packets into bytes and bytes into frames• Provides access to media using MAC address• Performs error detection not correction layer 1 Moves bits between devices• Specifies voltage, wire speed,• and pin-out of cables Application Layer - ANS -The seventh layer of the OSI model. Application layer protocols enable software programs to negotiate formatting, procedural, security, synchronization, and other requirements with the network. is acting as an interface between the actual application programs Presentation Layer - ANS -The sixth layer of the OSI model. Protocols in the 6 layer translate between the application and the network. Here, data are formatted in a schema that the network can understand, with the format varying according to the type of network used. also manages data encryption and decryption, such as the scrambling of system passwords. presents data to the Application layer and is responsible for data translation and code formatting. ensures that data transferred from the Application layer of one system can be read by the Application layer of another one Session Layer - ANS -The fifth layer in the OSI model. This layer establishes and maintains communication between two host on the network. It can be considered the "traffic cop" for network communications. keeps one application's data separate from other applications' data provides dialogue control between devices, or nodes. It coordinates communication between systems and serves to organize their communication by offering three different modes: simplex, half duplex, and full duplex Transport Layer - ANS -The fourth layer of the OSI model. In this layer protocols ensure that data are transferred from point A to point B reliably and without errors. this layer services include flow control, acknowledgment, error correction, segmentation, reassembly, and sequencing. Network Layer - ANS -The third layer in the OSI model. Protocols in this layer translate network addresses into their physical counterparts and decide how to route data from the sender to the receiver.

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