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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 159 discussion

Exam question from Amazon's AWS Certified Advanced Networking - Specialty ANS-C01
Question #: 159
Topic #: 1
[All AWS Certified Advanced Networking - Specialty ANS-C01 Questions]

A company has a 2 Gbps AWS Direct Connect hosted connection from the company’s office to a VPC in the ap-southeast-2 Region. A network engineer adds a 5 Gbps Direct Connect hosted connection from a different Direct Connect location in the same Region. The hosted connections are connected to different routers from the office with an iBGP session running in between the routers.

The network engineer wants to ensure that the VPC uses the 5 Gbps hosted connection to route traffic to the office. Failover to the 2 Gbps hosted connection must occur when the 5 Gbps hosted connection is down.

Which solution will meet these requirements?

  • A. Configure an outbound BGP policy from the router that is connected to the 2 Gbps connection. Advertise routes with a longer AS_PATH attribute to AWS.
  • B. Advertise a longer prefix route from the router that is connected to the 2 Gbps connection.
  • C. Advertise a less specific route from the router that is connected to the 5 Gbps connection.
  • D. Configure an outbound BGP policy from the router that is connected to the 5 Gbps connection. Advertise routes with a longer AS_PATH attribute to AWS.
Show Suggested Answer Hide Answer
Suggested Answer: A 🗳️
by Manh at July 27, 2023, 10:39 a.m.
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Manh
Highly Voted 1 year, 1 month ago
Selected Answer: A
BGP prefers routes with a shorter AS_PATH over routes with a longer AS_PATH. By advertising routes with a longer AS_PATH attribute from the 2 Gbps connection, you can make those routes less preferable than the routes advertised from the 5 Gbps connection. This way, the VPC will use the 5 Gbps connection to route traffic to the office, as long as it is available. If the 5 Gbps connection goes down, BGP will fail over to the 2 Gbps connection.
upvoted 8 times
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ISSDoksim
Highly Voted 1 year, 1 month ago
A - agreed, shorter AS_PATH is preferred
upvoted 6 times
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Newbies
Most Recent 5 months, 3 weeks ago
A -This configures the wrong router and doesn't leverage BGP policy effectively.
upvoted 1 times
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Vogd
8 months, 2 weeks ago
Selected Answer: A
Option B is wrong, since advertises the longest prefix to least preferred route. check https://docs.aws.amazon.com/directconnect/latest/UserGuide/routing-and-bgp.html
upvoted 2 times
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