Regarding the use of the network management system, which of the following options are correct? (Multiple choice)
A . The network management software has an alarm management function. For example, the UP/DOWN changes of the device port can be immediately fed back to the network management software through TRAP messages, so that the network administrator can discover and deal with network faults in time
B . The network management software has a performance management function. The network management software can automatically collect and count the points and rates of the device’s CPU and memory, and can assist the network administrator to analyze the network performance bottleneck.
C . The network management software has a configuration file management function, which can perform automatic backup, comparison, and restoration of configuration files, so that network administrators can automatically back up configuration files in batches
D . The network manager can regularly output reports according to user needs to provide reference for later network optimization
Answer: ABCD