Which of the following are included in the operating system patch violations level of Terminal security system?
(Choose two.)

• A.Low
• B.General
• C.Serious
• D.Important

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Which of the following statement about the NAT is wrong?

• A.NAT technology can effectively hide the costs of the LAN; it is an effective network security protection technology
• B.Address Translation can follow the needs of users, providing FTP, WWW, Telnet and other services outside the LAN
• C.Some application layer protocols carry IP address information in the data, but also modify the IP address information in the data of the upper layer when they are as NAT
• D.For some non-TCP, UDP protocols (such as ICMP, PPTP), unable to do the NAT translation

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About the description about the preemption function of VGMP management, which of the following statements is wrong?

• A.By default, the preemption function of the VGMP management group is enabled.
• B.Preemption means that when the faulty primary device recovers, its priority will be restored. At this time, it can regain its own state.
• C.By default, the preemption delay of the VGMP management group is 40s.
• D.After the VRRP backup group is added to the VGMP management group, the original preemption function on the VRRP backup group is invalid.

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Digital certificates can be divided into local certificates, CA certificates, root certificates and self-signed certificates according to different usage scenarios.

• A.False
• B.True

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In the USG series firewall system view, the device configuration will be restored to the default configuration after the reset saved-configuration command is executed. No other operations are required.

• A.False
• B.True

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