OSI Layers Reference
Interactive reference for the 7 OSI network model layers.
The OSI model defines 7 layers of network communication from physical cables to application protocols.
7Application
User interface, protocols
HTTP, HTTPS, FTP, SMTP, DNS, SSH
6Presentation
Data format, encryption, compression
SSL/TLS, JPEG, MPEG, ASCII
5Session
Session management, authentication
NetBIOS, RPC, NFS
4Transport
End-to-end delivery, flow control
TCP, UDP
3Network
Logical addressing, routing
IP, ICMP, ARP, RIP, OSPF
2Data Link
Physical addressing, error detection
Ethernet, Wi-Fi (802.11), PPP, Switch
1Physical
Raw bit transmission
Cables, Fiber, Radio waves, Hub
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Interactive reference for the 7 OSI network model layers.