The Seven Layers
OSI Networking and
Haikus of Nerdom

by Andrew Tejero

Application is
human machine interface
and message format

Presentation is
Compression, coding and or
Encryption also

Session provides us
session and permissions and
Authentication

The Transport Layer
End-to-end error control
Transport Services

Network Layer is
Addressing, Routing and NAT
It’s the best layer

Data Link Layer
MAC Address and Ethernet
Framing are a must.

Physical Layer
Wires, Radio. Better than
string and two tin cans.