DTP Flashcards
When running “show int trunk”, what does the output “n-“ designate?
The encapsulation type (ISL or 802.1q) was auto-negotiated.
What are the two DTP modes?
Auto and desirable.
How do you turn off DTP?
Switchport mode trunk, switchport nonegotiate
Briefly describe DTP.
Dynamic trunking protocol. Attempts to form trunks by sending a DTP frames out desirable ports.
Is DTP industry standard?
No, it is Cisco proprietary.
How often are DTP frames sent?
Every 30 seconds.
DTP is a security risk because it allows the introduction of ___ into your network.
Rouge switches.
What is a good command to use to check a trunk’s DTP status?
Show interface switchport. Look for the “Negotiation of Trunking” field. Use the pipe modifier.
What is a good command to use to check a trunk’s DTP status?
Show interface switchport. Look for the “Negotiation of Trunking” field.
If a switch supports ISL and 802.1q, what must you do before you can disable DTP?
Disable protocol negotiation, hard-code 802.1q protocol at the interface level.
