Part of the reason why the APT attack becomes difficult to defend is that it uses the vulnerabilities to attack.
This kind of zero-day hole usually requires flowers
A lot of time to research and analyze and produce corresponding defense methods.

Which of the following statements is true about the process of file filtering?

Regarding intrusion detection I defense equipment, which of the following statements are correct? (multiple choice)

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.

Regarding the sequence of the mail transmission process, which of the following is correct?
1. The sender PC sends the mail to the designated SMTP Server.
2. The sender SMTP Server encapsulates the mail information in an SMTP message and sends it to the receiver SMTP Server according to the destination address of the mail
3. The sender SMTP Server encapsulates the mail information in an SMTP message according to the destination address of the mail and sends it to the receiver POP3/MAP Senver
4. The recipient sends an email.