[单选] What is true about SYN cookies？（）

A . All TCPoptions are supported， such as largewindows.
B . The server can have more than8 unique MSS values.
C . SYN cookies are not implemented as a method of defending against SYN floods.
D . SYN cookies are implemented as a method of defending against SYN floods.

为什么说信息沟通是特殊的传播行为？直立人 Which three attribute-value pairs （AVPs） must be present in L2TPv3 ICRQ messages？（） PW capabilities list。 Message type。 Assigned control connection ID。 PW type。 Remote session ID。 Hostname。记忆的结构 What are two characteristics of RIPv2?（） classful routing protocol。 variable-length subnet masks。 broadcast addressing。 manual route summarization。 uses SPF algorithm to compute path。 What is true about SYN cookies？（）

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[单选] What is true about SYN cookies？（）

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