ANS-C01 Network Management and Operations Practice Question
A company uses AWS Direct Connect and VPN as backup. They have a Transit Gateway with multiple VPC attachments. The network engineer wants to ensure that traffic uses Direct Connect when available and fails over to VPN. Which configuration should be applied?
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
✓
Apply BGP community tags from Direct Connect to set a higher local preference.
AWS Direct Connect can apply BGP community tags that allow you to set a higher local preference for routes learned via Direct Connect compared to VPN routes. This ensures traffic prefers Direct Connect when available. Option A is incorrect because MED is used for influencing inbound route selection from multiple AS paths, not for preferring Direct Connect over VPN. Option B is incorrect because AS_PATH prepending affects how routes are advertised to neighbors, not how they are preferred locally. Option D is incorrect because BFD (Bidirectional Forwarding Detection) provides fast failure detection but does not influence route preference; it would be used in conjunction with routing policies, not as a standalone solution.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Set a higher MED value on the VPN BGP advertisements.
Why it's wrong here
MED is used for inbound route selection.
- ✗
Prepend AS_PATH on the VPN BGP advertisements to make them less preferred.
Why it's wrong here
AS_PATH prepending affects inbound routes, not outbound.
- ✓
Apply BGP community tags from Direct Connect to set a higher local preference.
Why this is correct
AWS uses BGP community tags to influence local preference.
- ✗
Configure BFD on both Direct Connect and VPN interfaces.
Why it's wrong here
BFD detects failures but does not control route preference.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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