In advance you need to know how your site is being attacked. The following two types of attacks are common:
1, traffic attacks, which is what we often call DDoS and Dos attacks, which are the most common bandwidth attacks in traffic attacks, typically use a large number of packets to overwhelm one or more routers, servers, and firewalls, so that your site is paralyzed and unable to open properly. But the cost of this attack will be high, so when you encounter such an attack do not panic, you can also try the defense system, so that the attack will not be targeted to your site.
2, CC attack, is also a traffic attack, CC is to simulate multiple users (how many threads is how many users) constantly access to those who need a lot of data operations (that is, the need for a lot of CPU time) of the page, resulting in a waste of server resources, the CPU for a long time in 100%, There is always an endless connection until the network is congested and normal access is aborted. And the CC attack is basically a port attack, these two attacks are basically a hard traffic attack, the following is a few attacks on the security of the database.
server under attack your best way is to find a hard-to-prevent room, so that the best, to the greatest extent possible to avoid our station again under attack.
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What if the server is under attack?