DDoS attack refers to the use of a large number of computers, servers, IoT devices, etc. to launch large-scale attacks, so that the target website, servers and other service resources can not provide normal service. DDOS attacks are usually launched by the attacker through the manipulation of a large number of "zombie" devices, which are infected with remote control, and become the attacker's "army" used to carry out attacks. These devices are infected and remotely controlled, and then become the attacker's "army", which is used to carry out the attack.

The principle of the attack is to send a large number of requests to consume the resources of the target service, such as network bandwidth, CPU, memory, etc., so that the target service can not provide services normally. These requests often have the same characteristics, such as from the same IP address, the same request method, the same request header, etc., so that the target service can not distinguish between normal requests and malicious requests.

DDOS attacks are generally realized as inaccessible websites, slow website response, business interruption, etc., which bring direct economic loss and reputation damage to the target service, and even cause long-term impact on the stability and availability of the service.

To prevent DDOS attacks, the following measures can be taken:

1. Increase bandwidth: Increasing bandwidth increases network traffic capacity, making it possible to withstand more traffic attacks.
2. Use a DDOS protection appliance: A DDOS protection appliance can analyze traffic to identify malicious traffic and filter it to protect the target service from attacks.
3. Limit Access Frequency: The frequency of access to the target service can be limited, e.g. limiting the number of accesses per second, thus preventing an influx of requests.
4. Regular data backups: Regular data backups ensure that in the event of an attack, services can be restored as quickly as possible.

In case of a DDoS attack, the following measures can be taken to deal with it:

1. Switch the service to an alternate server: If there is an alternate server, you can switch the service to the alternate server to avoid a direct attack.
2. Notify ISPs of filtering: ISPs can be notified to filter traffic, thus avoiding a large influx of attack traffic to the target service.
3. Use of CDN services: CDN services can be used to spread out attack traffic and protect the target service from attacks by deploying the service on servers in multiple geographic locations.

Self-help methods include:

1. Disconnect the server from the network as soon as possible to prevent the attacker from continuing the attack.
2. Seek professional help for server inspection and recovery.
3. Restore backup data to a new
4. on the server to restore the state before the attack.
5. Hardening the server to enhance its security to avoid being attacked again. Security measures such as strengthening access control, updating patches, encrypting transmissions, etc. can be taken.
6. In conclusion, DDOS attack is a serious network security threat, and services can be protected from attacks by increasing bandwidth, using DDOS protection equipment, limiting access frequency, and other preventive measures. When under attack, you can take handling measures such as switching services to alternate servers, notifying ISPs for filtering, and using CDN services. In terms of self-help, measures such as disconnecting the server from the network, seeking professional help, restoring backup data to a new server, and hardening the server can be taken to avoid being attacked again.

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