ANS-C01 Network Management and Operations Practice Question
A company has a Direct Connect connection with multiple virtual interfaces (VIFs). They notice that traffic from on-premises to a VPC is being dropped. The VPC is associated with a private VIF. The on-premises router has a BGP route to the VPC's CIDR. The VPC's route table has a route to the virtual private gateway. What is the MOST likely cause of the dropped traffic?
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 VPC route table does not have a route pointing to the virtual private gateway for the on-premises CIDR
For traffic to flow from on-premises to the VPC, the VPC must have a route back to the on-premises CIDR pointing to the virtual private gateway. Without that route, the return traffic will be dropped. Option B is incorrect because MTU issues typically cause packet fragmentation or loss, not complete drop due to missing routes. Option C is incorrect because the BGP session is established (as indicated by the BGP route being present). Option D is incorrect because allowed prefixes on the virtual private gateway control which routes can be advertised over BGP, not the return path in the VPC route table.
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 VPC route table does not have a route pointing to the virtual private gateway for the on-premises CIDR
Why this is correct
Return traffic is dropped without a route.
- ✗
The MTU size on the Direct Connect connection is too small
Why it's wrong here
MTU issues cause fragmentation, not drops.
- ✗
The BGP session is not established
Why it's wrong here
BGP is established as per the scenario.
- ✗
The allowed prefixes on the virtual private gateway do not include the on-premises CIDR
Why it's wrong here
Allowed prefixes are for the VPC CIDR to be advertised.
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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.