300-510 · Question #280
Refer to the exhibit. AJI four routers on the network reside in the same data center. The four routers are running IS-IS between them in Level 1 mode within an IPv4 network. After a network engineer i
The correct answer is B. Configure R2 and R3 to be Level 1/Level 2 routers. R1 and R2 are in IS-IS area 0001, while R3 and R4 are in area 0003. With all routers set to Level-1 only, there’s no Level-2 backbone to carry routes between the two areas, so R4 never learns prefixes from R1’s area. By turning R2 and R3 into Level-1/Level-2 routers, you create t
Question
Refer to the exhibit. AJI four routers on the network reside in the same data center. The four routers are running IS-IS between them in Level 1 mode within an IPv4 network. After a network engineer installed several new servers connected to R4, users connected via R1 reported they could not connect to applications on the servers. The engineer has determined that R4 is receiving routes from R3 but it is failing to receive routes from R1. Which action must the engineer take to resolve the issue?
Exhibit
Options
- AConfigure R3 only lo be a Level /Level 2 router
- BConfigure R2 and R3 to be Level 1/Level 2 routers
- CConfigure R2 only to be a Level 2 router
- DConfigure R1 and R4 to be Level 2 routers
How the community answered
(20 responses)- A15% (3)
- B75% (15)
- C5% (1)
- D5% (1)
Explanation
R1 and R2 are in IS-IS area 0001, while R3 and R4 are in area 0003. With all routers set to Level-1 only, there’s no Level-2 backbone to carry routes between the two areas, so R4 never learns prefixes from R1’s area. By turning R2 and R3 into Level-1/Level-2 routers, you create the necessary Level-2 “backbone” adjacency between areas 0001 and 0003, restoring end-to-end
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