AWS Certified Advanced Networking – Specialty ANS-C00 – Question151

Your company has two DX locations. You need to configure one link as passive. What should you configure in your router to set that link as the passive link.

A. Set a higher MED.
B. Configure AS_PATH Prepending on the link.
C. Advertise a network with a higher CIDR.
D. Call your service provider and have the ASN changed for that link.

Correct Answer: B

Explanation:

Explanation:
You should configure AS_PATH prepending on the link. A higher CIDR is the same as a more specific prefix, which will make the link more preferred. A higher MED will make the path less preferred, but this is not the preferred method to accomplish this. Changing your ASN will not help. Configuring AS_PATH Prepending is the preferred method of AWS to configure an Active-Passive configuration with Direct Connect.