单项选择题
Two Level 2 routers are exchanging Hello packets with different Area IDs. What occurs between these routers?（）
A. An Adjacency forms. B. An Adjacency does not form. C. An Adjacency forms but traffic is not forwarded. D. No IS-IS PDUs are sent.
单项选择题 What command would you use to view an IS-IS adjacency?（）
单项选择题 How do you enable interface fe-0/0/0 under the [edit protocols isis] level to form both a Level 1 and Level 2 adjacency?（）
单项选择题 How often are IS-IS Hello packets transmitted?（）
