When you suspect that the company's network has been attacked by hackers, you have carried out a technical investigation. Which of the following options does not belong to the behavior that occurred in the early stage of the attack?

What content can be filtered by the content filtering technology of Huawei USG6000? (Multiple Choices)

URL filtering technology can access control URLs for users according to different time objects and address objects, and achieve the purpose of accurately managing user online behavior.

Information security is the protection of information and information systems to prevent unauthorized access, use, leakage, interruption, modification, damage, and to improve For confidentiality, integrity and availability. ,

The status code in the HTTP response message describes the type of response message. There are many possible values.
Which of the following status codes indicates that the resource requested by the client does not exist?