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Cisco 300-420 Exam - Topic 10 Question 123 Discussion

Refer to the exhibit.Refer to the exhibit. A network engineer working for a private service provider with an employee ID: 4670:71:451 must design a BGP solution based on:All traffic originating from AS100 must pass through AS200 to reach the NTP and DHCP serverWhen a link failure occurs between R3 and R4, traffic must follow the R2-R9 link to reach the NTP and DHCP server.Which solution must the design include?
D) Router R3 applies a local preference of 200 for R1. R2. R9. and R11 routers to reach the data center.
A) Routers R3 and R10 advertise an IGP metric into BGP during redistribution in both directions.
B) Router R6 influences the paths of R9 and R11 to the DC with a higher AS-PATH value.
C) Routers R3 and R10 advertise a lower local preference for outgoing traffic and a higher AS-PATH value for incoming traffic.

Cisco 300-420 Exam - Topic 10 Question 123 Discussion

Actual exam question for Cisco's 300-420 exam
Question #: 123
Topic #: 10
[All 300-420 Questions]

Refer to the exhibit.

Refer to the exhibit. A network engineer working for a private service provider with an employee ID: 4670:71:451 must design a BGP solution based on:

All traffic originating from AS100 must pass through AS200 to reach the NTP and DHCP server

When a link failure occurs between R3 and R4, traffic must follow the R2-R9 link to reach the NTP and DHCP server.

Which solution must the design include?

Show Suggested Answer Hide Answer
Suggested Answer: D

by Lauryn at Apr 04, 2026, 08:30 PM

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Elouise
1 month ago
I’m leaning towards option C. Lower local preference can help manage traffic better.
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Paris
2 months ago
I feel option A could work too. IGP metrics in BGP? Sounds solid.
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Cathern
2 months ago
This question is tricky! I think option D makes sense.
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Sarina
2 months ago
Local preference of 200 for R1, R2, R9, and R11 is a solid choice!
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Sang
2 months ago
I disagree, option C seems more effective for traffic management.
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Diane
2 months ago
Wait, can R3 really influence that many paths? Sounds tricky.
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Jettie
4 months ago
I think option D makes the most sense here.
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Chantell
4 months ago
AS100 traffic needs to go through AS200, that's key.
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Tyra
5 months ago
I think option A could work since it talks about IGP metrics and redistribution, but I’m not entirely confident about how that interacts with BGP.
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Sylvie
5 months ago
I’m a bit confused about the AS-PATH values. I thought they were more about inbound traffic control, not sure how they apply here.
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Wava
5 months ago
This question feels similar to one we did in class about BGP path selection. I think option D might be the best fit since it mentions local preference.
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Alfred
5 months ago
I remember something about local preference influencing outbound traffic, but I'm not sure if it's the right choice here.
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