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7 Cards in this Set
- Front
- Back
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Physical Layer |
receives stream of bits, encodes them and places them on communication medium
moves physical PDUs |
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Data Link Layer |
"pack ship address" -organizes message bytes into frames of suitable size for transmission -negotiates frame sizes and speed -layers at both ends acknowledge exchanged packets |
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Network Layer |
-adds addressing info to PDU -establishes route and ensures size of PDUs compatible with all equipment |
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Transport Layer |
-quality assurance -error correction through handshaking with other transport layer -assures session layer that no network errors in data occurred -lowest layer were there is awareness of the network |
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Session Layer |
-arbitrates dialogue between two communicating nodes -controls direction and mode -supplies recovery checkpoints -if error re transmits all data from previous checkpoint |
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Presentation Layer |
provides high level data interpretation services for Application Layer -optionally includes data encryption |
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Application Layer |
supplies information and services to user interfaces with programs and data files -provides a high level API |
