单项选择题
A. request system storage cleanup candidates
B. request system services storage candidates
C. request system services candidate cleanup
D. request system storage cleanup dry-run
多项选择题 Which two commands allow you to return to a previous version of software on the device?（）
单项选择题 Which command do you issue to upgrade the current software on Junos devices?（）
单项选择题 You issue the command telnet interface ge-1/1/0 10.10.10.1 source 192.168.100.1 bypass-routing. Which statement is correct?（）