Two switches are connected and using Cisco Dynamic Trunking Protocol. SW1 is set to Dynamic Auto and SW2 is set to Dynamic Desirable. What is the result of this configuration?
Two switches are connected and using Cisco Dynamic Trunking Protocol. SW1 is set to Dynamic Auto and SW2 is set to Dynamic Desirable. What is the result of this configuration?
When using Cisco Dynamic Trunking Protocol (DTP), a switch port set to Dynamic Auto will passively wait to receive negotiation messages to form a trunk. A switch port set to Dynamic Desirable will actively attempt to form a trunk and send negotiation messages. Therefore, when SW1 is set to Dynamic Auto and SW2 is set to Dynamic Desirable, the link will successfully negotiate to become a trunk port.
Dynamic Auto — Makes the Ethernet port willing to convert the link to a trunk link. The port becomes a trunk port if the neighboring port is set to trunk or dynamic desirable mode. This is the default mode for some switchports. Dynamic Desirable — Makes the port actively attempt to convert the link to a trunk link. The port becomes a trunk port if the neighboring Ethernet port is set to trunk, dynamic desirable or dynamic auto mode.
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.
And yes, D is the right answer
D is correct
A trunk link is formed
D is correct
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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
According to the DTP matrix: Dynamic Auto | Dynamic Desirable | Trunk | Access Dynamic Auto | Access | Trunk | Trunk | Access Dyn Desirable | Trunk | Trunk | Trunk | Access Trunk | Trunk | Trunk | Trunk | Limited Connectivity (LC) Access | Access | Access | LC | Access