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Recently, I have made a preliminary investigation on DDOS attacks, and have some superficial understanding of the causes of DDOS attacks and their detection and defense mechanisms. This paper focuses on some thoughts on DDOS attacks in metropolitan area network environment under traditional network architecture.Think about whether we can expand and draw inferences from other examples.For example, in the above column, Xiao Hong suddenly didn't want to buy shoes, so he didn't want to accept the news of the seller's store, so Xiao Hong could cancel the subscription of the store.View container running status:An alter event statement modifies the definitions and properties of the event. We can make an event stop or make it active again, or we can modify the name of an event or the entire schedule. However, when an event defined using the ON COMPLETION NOT PRESERVE attribute is executed for the last time, the event does not exist directly and cannot be modified.However, under the circumstances at that time, I thought these things had little effect, because after we knocked them out, we began to gather in more quantities and launched attacks on positions from all directions. Judging from the form of attacks, they were quite organized and definitely beyond the reach of ordinary wild animals.