多选题Which two statements are correct regarding IS-IS？（）ARouters maintain a single link-state database per area.BRouters maintain a separate Level 1 link-state database.CRouters maintain a separate Level 2 link-state database.DRouters maintain a single Leve
题目
多选题
Which two statements are correct regarding IS-IS？（）
A
Routers maintain a single link-state database per area.
B
Routers maintain a separate Level 1 link-state database.
C
Routers maintain a separate Level 2 link-state database.
D
Routers maintain a single Level 1 link-state database per area.