单项选择题 When a non-root user connects to a JUNOS platform and enters a username and password, the user is immediately placed at which level?（）

单项选择题 Which statement is true about the internal link between the Routing Engine and the Packet-Forwarding Engine?（）

单项选择题 If the PFE does not have a route to the destination address of a packet, which action will be taken?（）