单项选择题
A.show session
B.show cdp neighbors
C.show users
D.show queue
多项选择题 WhichtwostatementsdescribetheadvantagestotheuseofRIPovertheuseofOSPF？（）
单项选择题 Which commands is necessary to permit SSH or Telnet access to a cisco switch that is otherwise configured for these vty line protocols?（）
单项选择题 On the network 131.1.123.0/27, what is the last IP address that can be assigned to a host?（）