Why switch to flooding?

The network often uses flooding to find things. The characteristics of the local network are broadcasting and flooding. Switch is a local network device. Flooding is convenient and efficient. Switch uses MAC table to forward data packets. If there is no destination MAC in the table, it cannot be forwarded. In the case of not knowing the exchange path, flooding can quickly deliver data packets to the destination. 同時に, the side effects of flooding also have different means to control