350-501 · Question #287
350-501 Question #287: Real Exam Question with Answer & Explanation
The correct answer is B: Set a tag value of 200 to match the summary address 10.0.0.0/16 on R3.. To selectively allow customer access to Area 1's 10.10.10.0/24 subnet, deny 20.10.30.0/24, and limit Area 2's routing table, the engineer must tag a summary address on R3 and then use a route map on R3 to leak only the tagged Level 2 routes into Level 1 Area 2.
Question
Refer to the exhibit. A network engineer must meet these requirements to provide a connects, solution: - The customer connected to Area 2 needs to access the application in Area 1 on the 10.10.10.0/24 subnet - The Customer must not have access to the 20.10.30.0/24 subnet. - The service provider must make sure that the Area 2 routing database limits the number of IP addresses in the routing table. Which two configurations must be implemented to meet the requirements? (Choose two)
Options
- ASet a tag value of 200 to match the summary address 10.0.0/16 on R2.
- BSet a tag value of 200 to match the summary address 10.0.0.0/16 on R3.
- CApply the route map for tag 200 and leak Level 2 routes into Level 1 Area 2 on R3
- DApply the route map for tag 200 and teak Level 2 routes into Level 1 Area 2 on R4.
- ESet a tag value of 200 to match the summary address 10.0.0./16 on R1.
Explanation
To selectively allow customer access to Area 1's 10.10.10.0/24 subnet, deny 20.10.30.0/24, and limit Area 2's routing table, the engineer must tag a summary address on R3 and then use a route map on R3 to leak only the tagged Level 2 routes into Level 1 Area 2.
Common mistakes.
- A. R2 is an internal router within Area 1; setting a tag there would not be effective for controlling route leaking from Level 2 to Level 1 Area 2, which occurs at the L1/L2 border router R3.
- D. R4 is an internal Level 1 router within Area 2, not a Level 1/Level 2 border router, and therefore is not responsible for leaking routes from Level 2 to Level 1 Area 2.
- E. R1 is an internal router within Area 1; setting a tag on R1 would not influence the process of leaking Level 2 routes into Level 1 Area 2 from the L1/L2 border router R3.
Concept tested. ISIS route leaking, summarization, and route tagging for filtering
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