[单选] 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 asauto.
D . The firewall does not support DTP. You should set the switchport trunk mode to ON

How many content definitions does CSG allow？（） 40。 400。 4000。 40000。下列选项中，对“侧目而视”所表含义错误的是（）敬畏。藐视。嫉视。怒视。金融工具的特征有（）。收益率。偿还期。变现能力。风险性。公开市场回购是指公司在特定时间发出的以某一高出股票当前市场价格的水平，回购既定数量股票的要约。（）财务管理中，长期投资又称为（）权益性投资。收益投资。直接投资。对外投资。 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？（）

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[单选] 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？ （）

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[单选] 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？（）