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Cisco Certified Network Associate (CCNA) · Cisco
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Found an excellent explanation of all 3 modes here: https://www.firewall.cx/networking-topics/vlan-networks/virtual-trunk-protocol/223-vtp-introduction.html
Dynamic Desirable - initiate negotiation messages and respond to negotiation messages to dynamically choose whether to start using TRUNK. Dynamic Auto - passively waits to receive TRUNK negotiation messages at which point the switch will respond and negotiate whether to use TRUNKING.