ANS-C01 Network Implementation Practice Question
A company has an AWS Direct Connect connection with a private VIF to a VPC. They also have a VPN connection as a backup. They want to use BGP attributes to prefer the Direct Connect path. On the customer router, they set a lower local preference for routes received via the VPN. However, traffic still uses the VPN. What could be the reason?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Local preference is not supported by AWS for BGP sessions; use AS path prepending instead
AWS does not honor the local preference attribute set on the customer router for routes received via the VPN. In AWS, BGP local preference is not considered; instead, AS path prepending is the standard method to influence route selection on the customer side. Option B is incorrect because weight is a Cisco-proprietary attribute that is not used in AWS BGP sessions. Option C is incorrect because BFD is used for fast failure detection, not path selection. Option D is incorrect because MED is used to influence inbound traffic from AWS, not to prefer the Direct Connect path on the customer router.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Local preference is not supported by AWS for BGP sessions; use AS path prepending instead
Why this is correct
AWS does not accept local preference; AS path prepending is used to influence outbound traffic.
- ✗
The weight attribute is set higher on the VPN routes
Why it's wrong here
Weight is not exchanged in BGP.
- ✗
Bidirectional Forwarding Detection (BFD) is not enabled on the Direct Connect connection
Why it's wrong here
BFD does not affect path selection.
- ✗
The BGP MED attribute is not set on the VPN routes
Why it's wrong here
MED is used for inbound traffic, not outbound.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This ANS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the ANS-C01 exam.