ANS-C01 Network Management and Operations Practice Question
A company uses AWS Direct Connect with a private VIF to connect to a VPC. The network team notices that traffic from on-premises to an EC2 instance in the VPC is taking a suboptimal path through the internet instead of the Direct Connect. 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 does not have a specific route for the VPC CIDR via the Direct Connect.
If the on-premises network does not have a specific route pointing to the Direct Connect for the VPC CIDR, traffic may use the internet. Option B is wrong because prefix lists are not required. Option C is wrong because ASN prepending would affect outbound traffic, not inbound. Option D is wrong because VPC route tables are not visible to on-premises.
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 does not have a specific route for the VPC CIDR via the Direct Connect.
Why this is correct
Without a specific route, traffic may default to internet.
- ✗
The VPC route table does not include a route to the Direct Connect gateway.
Why it's wrong here
VPC routing does not affect on-premises routing decisions.
- ✗
The Direct Connect virtual interface has BGP ASN prepending configured.
Why it's wrong here
ASN prepending affects outbound path selection, not inbound.
- ✗
The VPC route table does not have a prefix list for the on-premises CIDR.
Why it's wrong here
Prefix lists are for AWS, not for on-premises routing.
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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.