单项选择题

By default, an L1/L2 IS-IS router advertises what remote area routes into a Level 1 area?（）

A. only summarized routes
B. all routes in the network
C. all routes in the backbone
D. No routes are advertised.

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单项选择题

You have a Level 1-only router (Router A) in IS-IS area 49.0001.
How does Router A learn how to reach 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 2 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 1 link-state PDU (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.

单项选择题

There are three routers on a Gigabit Ethernet LAN: Router A, Router B, and Router C. Router A is the Designated Intermediate System (DIS) at Level 1 for that LAN. Router A's DIS priority is 64. The LAN is a Level 1-only link. Router D has just been powered up on that same LAN and its DIS priority is 80.
Which statement is true?（）

A. Router A remains the DIS and generates a new pseudonode LSP for that LAN
B. Router A remains the DIS and NO new pseudonode LSP is generated for that LAN
C. Router D becomes the new DIS, generates a new pseudonode LSP for that LAN, and purges the old pseudonode LSP generated by Router A
D. Router D becomes the new DIS, does NOT generate a new pseudonode LSP for that LAN, and does NOT purge the old pseudonode LSP generated by Router A

单项选择题

What does the LSP Holdtime field in an IS-IS database indicate?（）

A. the LSP age
B. the LSP refresh interval
C. the LSP elapsed lifetime
D. the LSP remaining lifetime