Which of the following attacks are belong to attacks against Web servers? (Multiple choices)

The most common form of traffic-based attacks is flooding a large number of seemingly legitimate messages to the target host, eventually resulting in the exhaustion of network bandwidth or device resources.
Traffic attack packets do not include which of the following options?

Which of the following options does not belong to the defense against HTTP flood attacks?

Which of the following statements is wrong about HTTP behavior?

After the Huawei USG6000 product license expires, the RBL function is unavailable.
Users can only use local black and white lists to filter spam.