What does DTP stand for in Cisco switching?
Dynamic Trunking Protocol
What is the purpose of DTP?
DTP is used to automatically negotiate trunk links between Cisco switches.
Which port modes actively send DTP frames?
Dynamic desirable and trunk
Which port mode will passively accept a trunk if offered, but not initiate it?
Dynamic auto
Which port mode disables DTP negotiation entirely?
Access or switchport nonegotiate
What are the two dynamic DTP modes?
Dynamic auto and dynamic desirable
What happens when both ends of a link are set to dynamic auto?
No trunk is formed, and the link remains an access port
Which port mode forces a port to become a trunk without sending DTP frames?
switchport mode trunk with switchport nonegotiate
What command disables DTP negotiation on a trunk port?
switchport nonegotiate
Why should DTP be disabled on user-facing ports?
To prevent VLAN hopping and trunk negotiation with malicious devices
How can you verify DTP activity on a switch interface?
Use the command: show dtp interface
What is the default port mode on many Cisco switches regarding trunking?
Dynamic auto
Which command sets a port to trunk mode and enables DTP?
switchport mode trunk
What is the risk of leaving DTP enabled on all switchports?
An attacker could form a trunk and gain access to all VLANs
Which DTP mode combination will always form a trunk?
Trunk on one end and dynamic desirable on the other
If a trunk is not forming what could be the issue?
encapsultation mismatch (isl vs dot1q, dynamic auto-dynamic auto, one side set to access.
How to shut off DTP on a port?
switchport mode trunk AND switchport nonegotiate
What is the best pracice for configuring traunking
set it to trunk mode and run switchport nonegotiate
