CDP
CDP is Cisco’s neighbor discovery protocol that shares device/interface info.
Updated: 2026-03-05
Definition
Cisco Discovery Protocol (CDP) allows Cisco devices to discover neighbors and exchange basic information.
It helps with troubleshooting and mapping but can leak information if exposed.
Key points
- Cisco proprietary neighbor discovery
- Helps identify neighbors and interfaces
- Disable on untrusted ports when needed
Common mistakes
- Leaving CDP enabled on internet-facing or untrusted interfaces.
- Confusing CDP with LLDP (standard).
Related exams
Related terms
Want to practice this in exam-style questions?
Use the mini tests on each exam page, then continue in the app for offline packs and detailed explanations.
Go to exams