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Exam 300-420 topic 1 question 220 discussion

Actual exam question from Cisco's 300-420
Question #: 220
Topic #: 1
[All 300-420 Questions]



Refer to the exhibit. A customer has two eBGP peerings from a single CE router toward two service providers. The customer has hired an architect to design a solution to ensure certain traffic enters the customer’s network through interface gig0/0. Which solution must the architect include in the design?

  • A. Break aggregated routes into longer prefixes and advertise to the preferred service provider.
  • B. Advertise a lower MED value toward the less preferred service provider.
  • C. Prepend additional AS on the AS path toward the preferred service provider.
  • D. Set a higher local preference to the preferred service provider path.
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Suggested Answer: A 🗳️
by ted_ba at April 27, 2023, 11:24 a.m.

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TheGorn
9 months, 4 weeks ago
Just playing devils advocate, I think this would work as well. Lower MED wins on the exact same route. router bgp 100 neighbor 1.1.1.1 remote-as 200 neighbor 2.2.2.2 remote-as 300 address-family ipv4 neighbor 1.1.1.1 route-map MED100 out neighbor 1.1.1.1 activate neighbor 2.2.2.2 route-map MED10 out neighbor 2.2.2.2 activate maximum-paths 2 exit exit ip access-list standard 200Host permit 200.200.200.200 exit route-map MED100 permit 10 match ip address 200Host set metric 100 exit route-map MED10 permit 10 match ip address 200Host set metric 10 exit
upvoted 2 times
TheGorn
9 months, 4 weeks ago
That theory was short lived. Evidently MED does not further propagate beyond the person you advertised it to. Sticking with the original answer I guess. Sorry for thinking outloud... lol
upvoted 2 times
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neiker45
10 months ago
I read "Certain traffic" as certain routes which would be bulked up in the aggregated routes. We open those up and specify the traffic (which would be in those longer prefixes) into the preferred service provider. Advertising a lower MED can work but it would shift all traffic. That's how I see it.
upvoted 1 times
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ted_ba
1 year, 6 months ago
Answer A is correct - certain traffic enters the customer’s so certain network will go to prefared ISP
upvoted 1 times
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C (25%)
B (20%)
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