In recent years, network attack incidents have been frequent, and the number has also increased. Especially, attacks against websites have intensified and shown explosive growth. The most common attack against websites is DDos attacks, and it is easy to be attacked if you are not careful. to paralysis. So what is a DDoS attack? What are the attack phenomena? Let's take a look.
What is a DDoS attack?
A DDoS attack is a distributed denial of service attack, and the DDoS attack method is a type of attack method based on the traditional DoS attack.
A single DoS attack generally adopts a one-to-one method. By creating and sending a large amount of useless data, it will cause network congestion to the attacked host, exhaust its service resources, and cause the attacked host to fail to communicate with the outside world.
With the development of computer and network technology, the difficulty of DoS attacks has increased, so DDoS attacks have emerged.
The principle is simple: the processing power of computers and networks has been increased by 10 times, and it is no longer effective to attack with one attacking machine, so DDoS is to use more puppet machines to launch attacks, with a bigger attack than before. scale to attack the victim.
In addition, DDoS attacks can not only attack computers, but also attack routers, because routers are a special type of computer.
What are the phenomena of DDoS attacks?
① There are a large number of waiting TCP connections on the attacked host
②The network is flooded with a large number of useless data packets
③The source address is false, creating high-flow useless data, causing network congestion, and making the victim host unable to communicate with the outside world normally
④ Utilize the flaws in the transmission protocol provided by the victim host to repeatedly send specific service requests at high speed, making the host unable to process all normal requests
⑤ In severe cases, the system will crash