单项选择题 The administrator is unable to establish connectivity between two Cisco routers. Upon reviewing the command output of both routers, what is the most likely caust of the problem?（）

多项选择题 Exhibit: Which of the following are true regarding the command output shown in the display (Choose two.)（）。

单项选择题 A switch is configured as a vtp sever with a domain name of CCNA.Which cisco ios privileged mode command,followed by are load of the swith,will reset the VTP management domain name of the switch to a NULL value?（）