Question 39 of 585 from exam ANS-C01: AWS Certified Advanced Networking

Q: A company has set up the following for connecting their on-premises data center to AWS. They require that in the event the primary connection to DataCenter1 goes down, traffic should be directed to Data Center2Which of the following should be done in the implementation phase? Select 2 answers.

Ensure DataCenter2 advertises less specific routes.Make use of AS-PATH prepending.

Question 39 of 585 from exam ANS-C01: AWS Certified Advanced Networking - Specialty

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Question

A company has set up the following for connecting their on-premises data center to AWS. They require that in the event the primary connection to DataCenter1 goes down, traffic should be directed to Data Center2

Which of the following should be done in the implementation phase? Select 2 answers.

Datacenter
10.00.06

Data Center2
10.1.0.016

172.16.0.0/16

Answers

A. Ensure static routes are in place. Ensure the routes are changed in case of a failover.

B. Ensure DataCenter2 advertises less specific routes.

C. Make use of AS-PATH prepending.

D. Make use of AWS Direct Connect as well.

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Explanations

Click on the arrows to vote for the correct answer

A. B. C. D.

Answer - B and C.

The AWS Documentation mentions this use case and how the routes should be configured.

· More specific routes: With this approach, both Customer Gateway 1 and Customer Gateway 2 advertise a summary route of 10.0.0.0/15

In addition, Customer Gateway 1 advertises 10.0.0.0/16 and Customer Gateway 2 advertises 10.1.0.0/16

AWS will use the more specific routes to send traffic to the appropriate data center and fail back to the other data center following the summarized route if the more specific route becomes temporarily unavailable.

· AS-path prepending: With this approach, both Customer Gateway 1 and Customer Gateway 2 advertise 10.0.0.0/16 and 10.1.0.0/16

However, Customer Gateway 1 uses AS-path prepending when advertising the 10.1.0.0/16 network to make this route less preferred.

Likewise, Customer Gateway 2 uses AS-path prepending when advertising the 10.0.0.0/16 network to make this route less preferred.

AWS will use the preferred routes to send traffic to the appropriate data center and will fail back to the other data center following the less preferred routes when necessary.

Option A is incorrect because you should use dynamic routes.

Option D is incorrect because we already have 2 VPN connections.

For more information on Datacenter high availability, please visit the below URL:

https://aws.amazon.com/answers/networking/aws-multiple-data-center-ha-network-connectivity/

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