ANS-C01 Network Management and Operations Practice Question
A network engineer is designing a hybrid network with Direct Connect and VPN backup. The company has multiple VPCs connected via Transit Gateway. They want to use BGP to exchange routes. Which BGP feature should be configured to fail over from Direct Connect to VPN if the Direct Connect link goes down?
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
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BGP communities
BGP communities allow AWS to tag routes from Direct Connect and VPN with different community values, enabling route preference control. By configuring the VPN routes with a lower preference (higher local preference via communities), traffic prefers Direct Connect when available. If Direct Connect fails, the VPN routes become active, providing failover. Option B (MED) influences inbound routing from external peers, not outbound preference within AWS. Option C (BFD) detects link failures faster but does not control route selection. Option D (AS_PATH prepending) is used to deprioritize routes outbound, not between Direct Connect and VPN.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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BGP communities
Why this is correct
Correct. BGP communities allow AWS to assign route preference, enabling failover from Direct Connect to VPN by setting higher local preference for Direct Connect routes.
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Multi-Exit Discriminator (MED)
Why it's wrong here
Incorrect. Multi-Exit Discriminator (MED) is used to influence inbound route selection from external ASes, not outbound preference between Direct Connect and VPN within the same AS.
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Bidirectional Forwarding Detection (BFD)
Why it's wrong here
Incorrect. Bidirectional Forwarding Detection (BFD) provides fast link failure detection but does not influence BGP route preference or failover logic.
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AS_PATH prepending
Why it's wrong here
Incorrect. AS_PATH prepending is used to make a route less preferred inbound, typically for influencing traffic from external peers, not for failover between Direct Connect and VPN.
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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.