📖 What is Switchport Mode Dynamic Auto?
The DTP mode where the port passively waits to receive DTP negotiation frames. It will become a trunk only if the neighboring port is set to Trunk or Dynamic Desirable.
"In newer Cisco Catalyst switches, 'dynamic auto' is the default mode on all ports. If two connected ports are both dynamic auto, they will remain as access ports."
📚 Certification: Certified Network Associate (200-301)
🔑 What are the Key Concepts of Switchport Mode Dynamic Auto?
- ▸ Passive DTP negotiation state
- ▸ Default interface state on modern Cisco Catalyst switches
- ▸ Fails to form a trunk if paired with another Dynamic Auto port
🎯 How does Switchport Mode Dynamic Auto appear on the 200-301 Exam?
Diagnosing why two switches connected together failed to form a trunk when both are left at default settings.
Selecting the correct mode to pair with a Dynamic Desirable port to successfully negotiate a trunk.
❓ Frequently Asked Questions
What happens if you connect two switches with ports set to Dynamic Auto?
They will fail to negotiate a trunk and will operate as access ports.
Does Dynamic Auto send DTP frames actively?
No, it passively listens for DTP frames from the other side before converting to a trunk.