Which of the following troubleshooting methods is not based on the TCP/IP reference model?

• A.Configuration comparison
• B.Top-down
• C.Bottom-up
• D.Replacement

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DHCP snooping is a valid security mechanism. Which of the following attack prevention methods can DHCP snooping provide? (Multiple Choice)

• A.Defense against MAC address flooding attacks
• B.Source MAC address check for data packets in collaboration with DAI
• C.Defense against DoS attacks on the DHCP server
• D.Defense against bogus DHCP server attacks
• E.Source IP address check for data packets in collaboration with IPSG

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Switches run the MSTP protocol by default. Which of the following statements regarding the default status is true?

• A.Each switch runs in an independent region.
• B.The STP calculation speed is faster than that when multiple instances are configured.
• C.All switches run in the same region by default.
• D.Due to lack of configuration, all switches switch the running mode to RSTP.

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Which of the following statements regarding NMS usage are true? (Multiple Choice)

• A.The NMS supports performance management. It automatically collects statistics about the CPU usage and memory usage of devices, helping the network administrator analyze network performance bottlenecks.
• B.Based on user requirements, the NMS can generate reports periodically, providing reference for subsequent network optimization.
• C.The NMS supports alarm management. For example, the Up/Down change of a port can be immediately reported to the NMS through trap, so that the network administrator can discover and rectify network faults in a timely manner.
• D.The NMS supports configuration file management, including automatically backing up, comparing, and restoring the configuration file, allowing the network administrator to configure automatic batch configuration file backup.

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Which of the following aspects should be considered for migration risk assessment?

• A.Key risk positions
• B.Risk impact scope
• C.Risk impact time
• D.Loss caused by risks

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