单项选择题

What is a valdi multicast MAC address?（）

A. 00:90:69:9F:EA:46
B. FF:FF:FF:FF:FF:FF
C. 01:00:5E:28:12:95
D. 99:99:99:99:99:99

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多项选择题

A. download and delete log files
B. view real-time statics of interfaces
C. reboot the system
D. view and add licenses
E. edit security settings

单项选择题

A. request system software replace
B. request system software install
C. request system software add
D. request system software upgrade

单项选择题

A. help log messages
B. man log messages
C. man syslog
D. help syslog