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单项选择题

8.What is the most important early step in the process of developing a successful speech?

A．Creating a preliminary bibliography.
B．Researching for speech materials.
C．Brainstorming for a central idea.
D．Formulating the specific purpose.

问答题

校园网的核心层和分布层交换机一般使用三层交换机，这些交换机上面一般需要配置什么路由协议？该协议属于哪种类型的路由协议？