ANS-C01 Network Security, Compliance and Governance Practice Question
A network engineer is troubleshooting connectivity issues between two VPCs that are peered. The VPCs are in the same region and the peering connection is in the 'active' state. Security groups in both VPCs allow all traffic. However, instances in VPC A cannot reach instances in VPC B. 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
✓
Route tables in one or both VPCs do not have routes pointing to the peering connection
VPC peering requires route table entries in both VPCs to direct traffic to the peering connection. Option C is correct because missing routes are a common issue. Option A is wrong because security groups allow all traffic. Option B is wrong because the peering connection is active. Option D is wrong because network ACLs are not mentioned as blocking, and they are stateless but the issue is more likely routing.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Security groups are blocking traffic between the VPCs
Why it's wrong here
They allow all traffic.
- ✗
The VPC peering connection is in the 'pending-acceptance' state
Why it's wrong here
The question states it is active.
- ✓
Route tables in one or both VPCs do not have routes pointing to the peering connection
Why this is correct
Without proper routes, traffic is not directed to the peering connection.
- ✗
Network ACLs are blocking traffic between the VPCs
Why it's wrong here
No indication of NACL blocking.
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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.