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 is formed. B. No IS-IS PDUs are sent. C. An Adjacency does not form. D. An Adjacency forms but traffic is not forwarded.
单项选择题 What is the maximum number of NET addresses supported on a virtual router?（）
单项选择题 Where is the IS-IS Network Entity Title configured?（）
多项选择题 What are three components of the NET address? （）(Choose three.)
