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
Which three functions are available under the Maintain tab of J-Web?（）

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
Which command do you issue to upgrade the current software on Junos devices?（）

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