You are configuring&

单项选择题You are configuring an 802.1Q trunk between a Layer 2 switch and a firewall. You read in the documentation that the best way to set up a trunk is to set the port as dynamic desirable. The trunk is not coming up. Which one of these options would be a valid explanation？（）: A、The firewall does not support Cisco Discovery Protocol. You should set the switchport trunk mode ON; B、The firewall does not support Cisco Discovery Protocol. You should set the switchport trunk mode to OFF; C、The firewall does not support Cisco Discovery Protocol. You should set the switchport trunk mode as auto; D、The firewall does not support DTP.You should set the switchport trunk mode to ON

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