ANS-C01 Network Management and Operations Practice Question
A company has an AWS Direct Connect connection with a private VIF to a VPC. They notice that traffic from the on-premises network to the VPC is being routed through the internet instead of the Direct Connect. The VPC route table has a route pointing to the virtual private gateway for the on-premises CIDR. 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 not advertising the prefix via BGP over the Direct Connect
If the on-premises router is not advertising the prefix via BGP over the Direct Connect, the VPC will not have a route to the on-premises network through the Direct Connect, causing traffic to go over the internet. Option A is incorrect because if the virtual private gateway were not attached, the VPC would have no route to the on-premises network at all. Option B is incorrect because security groups do not affect routing decisions; they filter traffic at the instance level. Option C is incorrect because a more specific route would still use the virtual private gateway, not the internet.
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 virtual private gateway is not attached to the VPC
Why it's wrong here
If not attached, the route would be invalid.
- ✗
The security group on the VPC resources blocks the traffic
Why it's wrong here
Security groups do not affect routing decisions.
- ✗
The on-premises CIDR is more specific than the VPC route table entry
Why it's wrong here
More specific routes would still use the virtual private gateway.
- ✓
The on-premises router is not advertising the prefix via BGP over the Direct Connect
Why this is correct
Without BGP advertisement, the route is not propagated to the VPC.
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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.