When using digital certificates for authentication in IPsec VPN, it should adopt IKE main mode negotiation and validation of certificate is completed in the 5th 6th packet of the packet exchange.

• A.TRUE
• B.FALSE

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Which of the following attacks is a SYN Flood attack?

• A.attacker sends a large number of SYN packets, which causes a large number of incomplete TCP connections to occupy the resources of the attacker.
• B.means that the attacker and the attacked object normally establish a TCP full connection, but there is no subsequent message.
• C.means that the attacker sends a large number of ICMP packets, such as ping, to the attacker.
• D.means that the attacker occupies the link bandwidth of the server by sending a large number of UDP packets to the attacker.

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