多项选择题 What should be done prior to backing up an IOS image to a TFTP server?（）

多项选择题 The network security policy requires that only one host be permitted to attach dynamically to each switch interface. If that policy is violated, the interface should shut down. Which two commands must the network administrator configure on the 2950 Catalyst switch to meet this policy?（）

多项选择题 Which of the following describe private IP addresses?（）