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Exam AWS Certified Advanced Networking - Specialty ANS-C01 All Questions

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Exam AWS Certified Advanced Networking - Specialty ANS-C01 topic 1 question 212 discussion

Exam question from Amazon's AWS Certified Advanced Networking - Specialty ANS-C01
Question #: 212
Topic #: 1
[All AWS Certified Advanced Networking - Specialty ANS-C01 Questions]

A company has two data centers that are interconnected with multiple redundant links from different suppliers. The company Uses IP addresses that are within the 172.16,0.0/16 CIDR block. The company is running iBGP between the two data centers by using a private Autonomous System Number (ASN) and IGP.

The company is moving toward a hybrid setup in which the company will initially use one VPC in the AWS Cloud. An AWS Direct Connect connection runs from the first data center to a Direct Connect gateway by using a private VIF. On the connection, the company advertises a summarized route for the 172.16.0.0/16 network. The company is planning to set up a second summarized route from the second data center to a different Direct Connect location.

The company needs to implement a solution to route traffic to and from AWS through the first Direct Connect connection. The solution must use the second Direct Connect connection for failover purposes only.

Which solution will meet these requirements?

  • A. Prepend the private ASN on the BGP announcements to AWS from the second data center. Add a second VIF in the first Direct Connect connection. Advertise the same network without any prepends from the first data center. Implement the same setup for the BGP announcement from AWS to the two data centers.
  • B. Tag the BGP announcements with the local preference BGP community tags. Set the tag to high preference for the first data center. Set the tag to low preference for the second data center.
    Configure the second data center’s router to have a lower local preference for the direct AWS BGP advertisements than for the advertisement from the fist data center.
  • C. Configure the Direct Connect gateway to prefer routing through the Direct Connect connection with the first data center. Configure the second data center’s router to have a lower local preference for the direct AWS BGP advertisements than for the advertisement from the first data center.
  • D. Configure the focal AWS Region BGP community tag on the BGP route that is advertised from the fist data center. Configure AS_PATH prepends on the BGP announcements from the second data center.
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Suggested Answer: B 🗳️
by Cacheirez at Aug. 13, 2024, 10 p.m.
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siheom
6 days, 3 hours ago
Selected Answer: A
VOTE A
upvoted 1 times
...
VerRi
1 month, 3 weeks ago
Selected Answer: A
A. updating AS_PATH for both 1st and 2nd data centres, making 2nd data centre less preferable. When 1st is down, they will switch to 2nd. B. local preference in BGP is used to control outbound traffic. The question says "to route traffic to and from AWS"  so it does not cover the inbound C.DXG does not handle this level of config D. It suggests using both community tags and AS_PATH prepends, but for the same reason as B
upvoted 3 times
...
luisgu
2 months, 3 weeks ago
Selected Answer: B
local region BGP communities do not apply in this case; only for public VIFs
upvoted 3 times
...
cas_tori
2 months, 4 weeks ago
Selected Answer: D
this is D
upvoted 1 times
...
aragon_saa
3 months, 1 week ago
Selected Answer: B
Answer is B
upvoted 3 times
...

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