Regarding the anti-spam local black and white list, which of the following statements is wrong?

• A.The black and white list is matched by extracting the destination IP address of the SMTP connection
• B.The black and white list is matched by the sender's dns suffix
• C.If the source IP address of the SMTP connection matches the blacklist, the connection will be blocked
• D.The black and white list is matched by extracting the source IP address of the SMTP connection

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When the Anti DDoS system finds the attack flow, the state will redirect the attack flow to the cleaning device.
After the cleaning device is cleaned, it will flow back.
Note to the original link, which of the following options does not belong to the method of re-injection?

• A.GRE back note:
• B.MPLS LSP back injection
• C.BGP back-annotation
• D.Policy routing back annotation,

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