ANS-C01 Network Implementation Practice Question
A company uses AWS Direct Connect with a private VIF to connect to a VPC. The VPC has a virtual private gateway (VGW). The on-premises network uses BGP to advertise routes. The company wants to ensure high availability by using two Direct Connect connections from different providers. Both connections terminate at the same Direct Connect location (same AWS device). The company configures two private VIFs, each with a separate BGP session, and attaches both to the same VGW. However, when one connection fails, traffic does not fail over. 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
✓
Both Direct Connect connections are on the same AWS device, creating a single point of failure
If both connections terminate at the same AWS Direct Connect location and same device, they share the same physical infrastructure. A failure at that location would affect both. True high availability requires connections at different locations. Also, BGP configuration may not have proper failover. The most likely cause is that both VIFs are on the same device, so a single point of failure exists. Option B (BGP ASN) is wrong because same ASN is allowed. Option C (allowed prefixes) would cause routes not to be accepted. Option D (MTU) would not cause complete failover failure.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Both Direct Connect connections are on the same AWS device, creating a single point of failure
Why this is correct
Same location and device means no redundancy.
- ✗
The same BGP ASN is used for both VIFs, causing route conflict
Why it's wrong here
Same ASN is allowed and common.
- ✗
The MTU size is mismatched between the VIFs
Why it's wrong here
Would not prevent failover.
- ✗
The allowed prefixes for the VIFs do not include the on-premises subnets
Why it's wrong here
Would affect both VIFs equally.
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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.