单选题You have a Level 1-only router (Router A) in IS-IS area 49.0001. How does Router A learn how to get to IP prefixes in other areas?（）ARouter A must have a Level 2 adjacency with the Level 1/Level 2 router in area 49.0001.BThe Level 1/Level 2 router in area 49.0001 sets the attached bit in the Level 1 link-state PDU (LSP) it floods into area 49.0001.CThe Level 1/Level 2 router in area 49.0001 sets the attached bit in the Level 2 LSP it floods into area 49.0001.DThe Level 1/Level 2 router in area 49.0001 advertises these prefixes into area 49.0001 using a Level 2 LSP it floods into the area.
单选题
You have a Level 1-only router (Router A) in IS-IS area 49.0001. How does Router A learn how to get to IP prefixes in other areas?（）
A
Router A must have a Level 2 adjacency with the Level 1/Level 2 router in area 49.0001.
B
The Level 1/Level 2 router in area 49.0001 sets the attached bit in the Level 1 link-state PDU (LSP) it floods into area 49.0001.
C
The Level 1/Level 2 router in area 49.0001 sets the attached bit in the Level 2 LSP it floods into area 49.0001.
D
The Level 1/Level 2 router in area 49.0001 advertises these prefixes into area 49.0001 using a Level 2 LSP it floods into the area.
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