OSI Model

Application Layer

• Layer 5

• Layer 1

• Layer 7

• Layer 4

The Network Layer

• Layer 5

• Layer 1

• Layer 7

• Layer 3

Data Link Layer

• Layer 6

• Layer 2

• Layer 5

• Layer 3

Layer 5

• The basic network

• Character encoding

• Communication management between devices

• The physics of the network

Session Layer

• Layer 4

• Layer 1

• Layer 3

• Layer 5

Presentation Layer

• Layer 6

• Layer 1

• Layer 7

• Layer 4

Layer 3

• The “post office” layer

• Communication management between devices

• The “routing” layer

• The “switching” layer

Layer 6

• Application encryption

• The layer we see

• The physics of the network

• The “routing” layer

Layer 2

• The physics of the network

• The “routing” layer

• Application encryption

• The “switching” layer

Layer 1

• The “routing” layer

• The physics of the network

• The “post office” layer

• The layer we see