单项选择题 Which parameter can be tuned to affect the selection of a static route as a backup.when a dynamic protocol is also being used?（）

单项选择题 If IP routing is enabled, which two commands set the gateway of last resort to the default gateway? （）

多项选择题 Refer to the exhibit. The two exhibit devices are the only Cisco devices on the network. The serial network between the two devices has a mask of 255.255.255.252. Given the output that is shown, what three statements are true of these devices? （）