Regarding the problem that users with two-way binding in authentication-free mode cannot access network resources, which of the following options are possible reasons? (Multiple choices)

• A.The authentication action in the authentication policy is set to "no account/authentication-free"
• B.Authentication-free users and authenticated users are in the same security zone
• C.The authentication-free user does not use a PC with the specified IP/MAC address
• D.Online users have reached the maximum value

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Which of the following is not used by the Detection link in the P2DR model?

• A.Real-time monitoring
• B.Alarm
• C.Detection
• D.Close service

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The tunnel addresses at both ends of the GRE tunnel can be configured as addresses of different network segments.

• A.True
• B.False

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Which of the following is not a hash algorithm?

• A.MD5
• B.SHA1
• C.SM1
• D.SHA2

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Regarding the description of VGMP group management, which of the following is wrong?

• A.The interface types and numbers of the heartbeat ports of the two firewalls can be different, as long as the Layer 2 interoperability can be ensured.
• B.The active and standby equipment learns the status of each other through the heartbeat line exchange messages, and backs up related commands and status information.
• C.All changes in the active/standby status of a VRRP backup group need to be notified to the VGMP management group it belongs to
• D.The VGMP of the active and standby firewalls periodically send hello messages

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