ANS-C01 Network Implementation Practice Question
A company needs to connect its on-premises data center to AWS using AWS Direct Connect. The company has two redundant connections and wants to use BGP as the routing protocol. Which BGP attribute should be manipulated to influence outbound traffic from AWS to the on-premises network?
⚠ Common exam trap
Test-takers frequently confuse inbound vs. outbound traffic manipulation: candidates often pick Local Preference (Option A) because it is a common attribute for influencing path selection, but it only affects traffic entering the local AS, not traffic leaving AWS.
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
✓
Prepend AS_PATH on routes advertised to AWS.
To influence outbound traffic from AWS to the on-premises network, you must make the on-premises routes less attractive to AWS. Prepend AS_PATH on routes advertised to AWS increases the AS path length, making those routes less preferred by AWS's BGP best-path selection, thus steering traffic away from that Direct Connect virtual interface.
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 the Local Preference attribute on routes received from AWS.
Why it's wrong here
Local Preference is used within an AS, not sent to peers.
- ✓
Prepend AS_PATH on routes advertised to AWS.
Why this is correct
AS_PATH prepend makes a path less preferred for outbound traffic from AWS.
- ✗
Set the MED attribute on routes advertised to AWS.
Why it's wrong here
MED influences inbound traffic from on-premises to AWS.
- ✗
Apply a BGP community tag to routes received from AWS.
Why it's wrong here
Community tags can be used for route filtering but not directly for outbound traffic influence.
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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.