According to the network diagram regarding hot standby, which of the following are correct? (Choose three answers)

• A.If a VRRP group is added to the VGMP management group, preemption will fail. The VGMP unified management group decides this behavior.
• B.By default, the preemption delay is 0.
• C.With VGMP management group preemption and VRRP backup groups, when the management group fails and recovers, the priority management group will also be restored.
• D.VRRP backup group itself has preemption. As shown, when USG_A failurs and is restored, USG_A re-use preemption becomes it has master status.

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HTTP Flood attacks refer indirectly to the target server to initiate a large number of HTTP packets to burden the server so that it can not respond to normal requests.
Through the interface rate limit function, HTTP flood attacks can be prevented.

• A.FALSE
• B.TRUE

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An attack source will spoof the server and send a large number of SYN-ACK packets to the attacking target network or server. If the destination port of the packet is the TCP service port of the attacked server, the TCP protocol stack of the server will be abnormal. What is it?

• A.Connection Flood
• B.SYN Flood
• C.SYN-ACK Flood
• D.ACK-Flood

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In the IPsec NAT traversal application scenarios, the firewall must be configured to initiate party NAT traversal, and the other end can not configure firewall NAT traversal related commands.

• A.FALSE
• B.TRUE

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An administrator can view the IPSec status information and debugging information as follows. What is the most likely fault?

• A.local ike policy does not match the peer ike policy.
• B.local ike remote namet and peer ikename do not match
• C.local ipsec proposal does not match the peer ipsec proposal.
• D.The local security acl or the peer security acl does not match.

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