单项选择题 A cisco router is booting and has just completed the POST process.It is now ready to find and load an IOSimage.what function does the router perform next?（）

单项选择题 Router A is unable to reach Router B.Both routers are running ios version 12.0.After reviewing the command output and graphic,what is the most likely cause of the problem?（）

单项选择题 Which command enables IPv6 forwarding on a cisco router?（）