以下关于交换机获取与其端口连接设备的MAC地址的叙述中，正确的是（ ）。
- A.交换机从路由表中提取设备的MAC地址
- B.交换机检查端口流入分组的源地址
- C.交换机之间互相交换地址表
- D.由网络管理员手工输入设备的MAC地址
正确答案及解析
正确答案
解析
网桥刚刚连接到以太网时，其转发表是空的。这时若网桥收到一个帧，它将怎样处理呢 网桥就按照以下自学习（self-learning）算法处理收到的帧（这样就逐步建立起转发表），并且按照转发表把帧转发出去。这种自学习算法的原理并不复杂，因为：若从某个站A发出的帧从接口x进入了某网桥，那么从这个接口出发沿相反方向一定可以把一个帧传送到A。所以网桥只要每收到一个帧，就记下其源地址和进入网桥的接口，作为转发表中的一个项目。
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