| Data Link Protocols of Cisco |
|---|
| DTP: Dynamic Trunk Protocol |
| ISL & DISL: Cisco Inter-Switch Link Protocol and Dynamic ISL Protocol |
| CDP: Cisco Discovery Protocol |
| Cisco VTP: VLAN Trunking Protocol |
| Other Cisco Protocols |
|---|
| NetFlow: Cisco Network Traffic Monitoring and Management Protocol |
| XOT: X.25 Over TCP |
| SCCP: SS7 Signalling Connection Control Part |
| Security/VPN Protocols of Cisco |
|---|
| TACACS: Terminal Access Controller Access Control System |
| L2F: Layer 2 Forwarding Protocol |