ANS-C01 Network Management and Operations Practice Question
Network Topology
Refer to the exhibit. A network engineer has established a VPC peering connection between VPC A (10.0.0.0/16) in account 111111111111 and VPC B (192.168.0.0/16) in account 222222222222. The peering connection status is 'active'. 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 to the peer CIDR
The VPC peering connection is active, so A is incorrect. The CIDR blocks (10.0.0.0/16 and 192.168.0.0/16) do not overlap, so D is incorrect. Security groups can block traffic, but the most common cause is missing routes in the route tables of one or both VPCs to the peer CIDR via the peering connection. Therefore, B is correct.
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 peering connection is not in the 'active' state
Why it's wrong here
Status shows 'active'.
- ✓
Route tables in one or both VPCs do not have routes to the peer CIDR
Why this is correct
Missing routes prevent communication.
- ✗
Security groups in VPC B are blocking traffic
Why it's wrong here
Possible but not the most likely.
- ✗
The CIDR blocks overlap
Why it's wrong here
They are different.
Visual reference
Go deeper
Related to this question
About these practice questions
This ANS-C01 question is part of Courseiva's 1,621-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
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.