Which of the following is true about firewall security policies?

• A.By default, the security policy can control unicast packets, broadcast packets, and multicast packets.
• B.By default, the security policy only controls unicast packets.
• C.By default, the security policy can control multicast
• D.By default, the security policy can control unicast packets and broadcast packets

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Regarding the description of the intrusion detection system, which of the following is wrong?

• A.The intrusion detection system can dynamically collect a large amount of key information through the network and computer, and can analyze and judge the current state of the entire system environment in time
• B.Once the intrusion detection system finds any behavior that violates the security policy or the system has traces of being attacked, it can implement blocking operations
• C.The immersion detection system can be linked with firewalls and switches, becoming a powerful "assistant" of the firewall, and better and more precise control of traffic access between domains
• D.Intrusion detection system includes all software and hardware systems used for intrusion detection

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When the administrator upgrades the USG firewall software version, which of the following operations are necessary? (Multiple choice)

• A.Specify the software version to be loaded next time
• B.Restart the device
• C.Upload firewall version software
• D.Restore factory settings

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Regarding the description of the operating system, which of the following is wrong?

• A.The interface between the operating system and the user is a graphical interface
• B.The operating system is the interface between the user and the computer
• C.The operating system itself is also software
• D.The operating system is responsible for managing all the hardware resources of the computer system and controlling the execution of the software.

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VGMPIn which of the following situations occurs in the group, the group will not actively send the message to the peerVGMPmessage/

• A.Dual-system hot backup function enabled
• B.Session table entry changes
• C.Manually switch the active and standby status of the firewall
• D.Firewall service interface failure

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