大家帮我看看我的想法对不对？
Bridges and switches increase the size of a collision domain.
他们应该是增加了collision的数量，而非大小。
A bridge will forward a broadcast but a switch will not.
switch只有在设置了VLAN才不会发送广播！
Bridges and switches learn MAC addresses through examining the source
MAC address.
根据我查书的结果，肯定是通过检测原MAC地址！不是吗？
