Reference model, sniffers inspect the two lowest levels, the physical and data link layers.
| OSI 계층번호 |
계층명 | 해당 프로토콜 |
|---|---|---|
| Layer 7 | Application | DNS, FTP, HTTP, SMTP, SNMP, Telnet |
| Layer 6 | Presentation | XDR(External Data Representation) |
| Layer 5 | Session | Named Pipes, RPC |
| Layer 4 | Transport | NetBIOS, TCP, UDP |
| Layer 3 | Network | ARP, IP, IPX, OSPF |
| Layer 2 | Data Link | Arcnet, Ethernet, Token Ring |
| Layer 1 | Physical | Coaxial, Fiber Optic, UTP |