7 Layers of The OSI Model
The acronym is Please Do Not Throw Sausage Pizza Away (backwards mnemonic for the 7 OSI reference model layers)
- Layer 1 – Physical * Cable, Network Interface Cards, Hubs
- Layer 2 – Data Link * Mac Address, Switches
- Layer 3 – Network * Ip Address, Routers
- Layer 4 – Transport * TCP, UDP, Port Numbers
- Layer 5 Session * Start & Stop Sessions
- Layer 6 Presentation * Format Data, Encryption
- Layer 7 Application * SMTP, FTP, Telnet
