Refer to the exhibit． Switch-1 needs to send data to a host with a MAC address of 00b0．d056．efa4． What will Switch-1 do with this data?

A、 Switch-1 will drop the data because it does not have an entry for that MAC address．
B、 Switch-1 will flood the data out all of its ports except the port from which the data originated．
C、 Switch-1 will send an ARP request out all its ports except the port from which the data originated．
D、 Switch-1 will forward the data to its default gateway．

【正确答案】 B

【答案解析】首先Switch 1需要发送一个数据到MAC地址为00b0．d056．efa4的主机，了解到目的地后，就查看他的MAC 地址表，然后发现在MAC地址表中没有这个MAC地址的条目存在。交换机在收到未知的单播，组播和广播时，都采用的是泛洪的方式，往除收到数据的这个接口外的所有接口都发送。所以在这儿，Switch 1也采取的上泛洪的方式。