单项选择题 Refer to the exhibit. Routers A and B are directly connected and running EIGRP，but they are unable to form a neighbor relationship. What is the most likely cause？（）

单项选择题 Refer to the exhibit. You are setting up a 2-gigabit EtherChannel. Following IEEE standards， the exhibit shows your configuration in a local switch1. However， EtherChannel is not coming up. Which one of these statements could be a possible reason？（）

单项选择题 Refer to the exhibit. Routers A and B are directly connected. Given the configuration, how many EIGRP routes will router B see in its routing table?（）