IP交换是一种利用交换硬件快速传送IP分组的技术。一台IP交换机由 (1) 三部分组成。IP交换机初始化后为每一个物理连接建立一个默认的 (2) ，相邻的IP交换机通过这些默认通道交换路由信息和数据分组。为了进行第三层路由选择，IP交换控制器必须根据 (3) 等信息对网络数据流进行分类并加上数据流描述符。
A．源和目标IP地址、MAC地址
B．源IP地址、ATM VPI/VCI
C．目标P地址、TCP/UDP端口号
D．源和目标IP地址、TCP/UDP端口号
参考答案：D
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A ____________ works in a restaurant. Let's go to the restaurant to eat ____________. 2. He is a ____________. He works in a department store. A ____________ works in a department store. 3. He is a ____________. He works in an office building. A ____________ works in an office building 4. Let's go to the ____________ to fly ____________. 5. Let's go to the ____________ to read ____________. |