How E-mail works

APPLICATION

Layer 7 Identified sender and intended receiver.

PRESENTATION

Layer 6 Encode/Decoded data.

SESSION

Layer 5 Initiated and terminated the session as well as making sure all data is sent intact.

TRANSPORT

Layer 4 Make sure all data has arrived/Send all data to source. Keep track of how many hops; open shortest path first

NETWORK

Layer 3 First put all data into packets and frames

DATA LINK

Layer 2 The initial connection set up. Send as electrical signal over the network.

PHYSICAL

Layer 1 Devices are ready to Send/Receive electrical signal over the network cable.