單項選擇題

Which command shows your active Telnet connections?（）

A. show session
B. show cdp neighbors
C. show users
D. show queue

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單項選擇題

Which commands is necessary to permit SSH or Telnet access to a cisco switch that is otherwise configured for these vty line protocols?（）

A. transport type all
B. transport output all
C. transport preferred all
D. transport input all

單項選擇題

What is the OSPF default frequency,in seconds,at which a cisco router sends hello packets on a multi-access network?（）

A. 10
B. 40
C. 30
D. 20

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