OSI model

application is which number in the layer?

7

presentation is which number in the layer?

6

session is which number in the layer?

5

transport is which number in the layer?

4

network is which number in the layer?

3

Datalink is which number in the layer?

2

physical is which number in the layer?

1

Example of Application?

This is what we see (what end user sees)

example of presentation

JPG GIF SSL

Example of session

RPC (remote procedural protocol) SCP (session control protocol)

example of transport

TCP UDP

example of network

Routers layer 3 swtich

example of data link

layer 2 mac swtich

examaple of physical

Hubs cables

what does data link do?

Reads The mac address

what does network do?

Reads the IP address

what does the transport do?

responsible for how exactly the packets transport

what does the session do?

this establishes and ends connections

what does the presensation do?

it encrypts and formats data.