ANS-C01 Network Security, Compliance and Governance Practice Question
A company uses AWS Direct Connect to connect their on-premises network to AWS. They have a VPC with a virtual private gateway (VGW) and a private VIF attached to it. They recently added a second Direct Connect connection for redundancy. Both connections are active and advertised via BGP. The on-premises network uses BGP with the same AS number. After configuration, they notice that traffic is not load-balanced as expected; instead, all traffic flows through one connection. What is the most likely cause?
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
✓
The on-premises router is configured with a higher local preference for one of the BGP sessions, causing it to prefer that path.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The on-premises router has a static route pointing to the primary connection, overriding BGP learned routes.
Why it's wrong here
If static routes exist, BGP routes may be ignored. However, the stem says they are using BGP, and static routes would conflict.
- ✗
Both Direct Connect connections are in the same AWS region and use the same VGW, so traffic cannot be load-balanced.
Why it's wrong here
Multiple Direct Connect connections can be used with the same VGW for load balancing if BGP multipath is enabled.
- ✓
The on-premises router is configured with a higher local preference for one of the BGP sessions, causing it to prefer that path.
Why this is correct
BGP path selection can be influenced by local preference. If one session has a higher local preference, all traffic will use that path.
- ✗
The Direct Connect connections are using different VLANs, causing asymmetric routing.
Why it's wrong here
Different VLANs do not cause asymmetric routing as long as BGP is configured correctly.
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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.