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| 7. Application | FTP, DNS, HTTP, DHCP, Telnet | Data |
| 6. Presentation | Format des données, ex: ASCII, GIF, MPEG | Data |
| 5. Session | Contrôle des sessions entre applications | Data |
| 4. Transport | TCP, UDP, SPX [Firewall] | Segments |
| 3. Network | IPV4, IPV6, IPX, IPSEC [Routers] | Paquets |
| 2. Data Link | Mac Adresse, ARP, Frame Relay [Switchs] | Trames |
| 1. Physical | Hub, Répéteur, Modem, Câble Ethernet | Bits |
| Application | ex : http |
| Transport | ex : port → Segment |
| Internet | ex : Ping |
| Network Access | ex : ARP |