On a Cisco switch port, which administrative mode actively transmits Dynamic Trunking Protocol (DTP) frames to initiate trunking negotiation with the device on the other end of the link?
The correct mode is dynamic desirable. In this mode, the switch port sends DTP messages to the neighbor, indicating that it is willing and able to form a trunk. Dynamic auto only listens for DTP frames and will not initiate the exchange; access and nonegotiate prevent dynamic negotiation entirely. Therefore, only dynamic desirable actively starts the negotiation process.
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Cisco CCNA 200-301
Network Access
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