Which of the following options does not belong to the security risk of the application layer of the TCP/IP protocol stack?

• A.Port scan
• B.Buffer overflow
• C.System vulnerabilities
• D.Virus

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Buffer overflows, Trojan horses, and backdoor attacks are all attacks at the application layer.

• A.True
• B.False

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The realization of content security filtering technology requires the support of the content security combination license.

• A.True
• B.False

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Anti-DDoS defense system includes: management center, detection center and cleaning center.

• A.True
• B.False

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

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