单选题Two Level 1 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 sentC An Adjacency does not form.D An Adjacency forms but traffic is not forwarded.
题目
单选题
Two Level 1 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.