For the description of the Anti DDOS system, which of the following options is correct? C

In the big data intelligent security analysis platform, it is necessary to collect data from data sources, and then complete a series of actions such as data processing, detection and analysis, etc.
Which of the following options does not belong to the action that needs to be completed in the data processing part?

Which of the following options is correct for the sequence of the flow-by-stream detection of AntiDDoS?
1. The Netflow analysis device samples the current network flow;
2. Send a drainage command to the cleaning center;
3. Discover the DDoS attack stream;
4.Netior: analysis equipment sends alarms to ATIC management center
5. The abnormal flow is diverted to the cleaning center for further inspection and cleaning;
6. The cleaning center sends the host route of the attacked target IF address server to the router to achieve drainage
7. The cleaning log is sent to the management center to generate a report;
8. The cleaned traffic is sent to the original destination server.

Abnormal detection is to establish the normal behavior characteristic profile of the system subject through the analysis of the audit data of the system: check if the audit data in the system If there is a big discrepancy with the normal behavior characteristics of the established subject, it is considered an intrusion. Nasu must be used as the system subject? (multiple choice)

Regarding firewall and IDS, which of the following statements is correct?