In a stateful inspection firewall, when the stateful inspection mechanism is enabled, the second packet of the three-way handshake (SYN+ACK) when reaching the firewall, which of the following descriptions is correct if there is no corresponding session table on the firewall?

• A.Packets must not pass through the firewall
• B.The firewall does not create a session table, but allows packets to pass through
• C.If the firewall security policy allows packets to pass, create a session table
• D.Packets must pass through the firewall and establish a session

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About the packet iniptablesDescription of the transfer process, which of the following options is incorrect?

• A.When a packet enters the network card, it first goes to matchPREROUTINGchain
• B.If the destination address of the data packet is not the local machine, the system sends the data packet toOUTPUTchain
• C.If the destination address of the data packet is not the local machine, the system sends the data packet toFORWARDchain.
• D.If the destination address of the data packet is the local machine, the system will send the data packet toINPUTchain.

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Which of the following attacks is not a special message attack?

• A.ICMP unreachable packet attack
• B.Oversized ICMP packet attack
• C.ICMP redirect packet attack
• D.IP address scanning attack

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When the company's network administrator is performing dual-system hot backup, due to the possibility of inconsistent round-trip paths, if he wants to enable the session fast backup function, the command that needs to be entered is ______[fill in the blank]*

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In the process of using the digital envelope, which of the following information will be encrypted? (Multiple choice)

• A.Receiver's public key
• B.Symmetric key
• C.User data
• D.Receiver's private key

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