Outubro 2008
Prof. Ismael H. F. Santos
- ismael@tecgraf.puc-rio.br
2
Design Strategies
nThe
communication network is partitioned into the following multiple layers
nPhysical layer – handles the mechanical and electrical details of the physical transmission of a bit
stream.
nData-link layer – handles the frames, or fixed-length parts of packets, including any error detection and recovery
that occurred in the
physical layer.
nNetwork layer – provides connections and routes packets in the communication network, including handling the address of outgoing packets, decoding the address of incoming packets, and maintaining routing information
for proper response to
changing load levels.