The 5 Basic Layers
nLayer 1:
Physical
Layer - mechanical and electrical network interface
definitions
nLayer 2:
Data Link Layer -
framing, data transparency,
error control over one link/trunk
nLayer
3: Network Layer - routing, addressing, call set-up and clearing across the data
network, flow control
(internal and external)
nLayer 4: Transport Layer - end-to-end message transfer, connection management, error control
nLayer 5: Application Layer – user processes