ANS-C01 Network Implementation Practice Question
A financial services company is designing a multi-region architecture for disaster recovery. They have a primary VPC in us-east-1 and a standby VPC in us-west-2. Each VPC has its own CIDR block (10.0.0.0/16 and 10.1.0.0/16). They want to use an inter-region VPC peering connection for replication traffic. Which of the following is a required step to establish this peering connection?
⚠ Common exam trap
The ANS-C01 exam often tests the misconception that VPC peering is automatically bidirectional or that both owners must initiate separate requests, but in reality, a single request and acceptance creates a bidirectional link, and the trap here is that candidates may think overlapping CIDRs or VPN attachments are required for inter-region peering.
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 owner of each VPC must accept the peering connection request.
Inter-region VPC peering connections require both VPC owners to accept the peering request. In AWS, a VPC peering connection is a one-to-one relationship between two VPCs, and the request must be accepted by the owner of the accepter VPC (in this case, the standby VPC in us-west-2) after the requester VPC (us-east-1) initiates it. This acceptance is a mandatory step for the peering connection to become active, regardless of whether the VPCs are in the same or different regions.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Ensure the VPC CIDR blocks do not overlap.
Why it's wrong here
Non-overlapping CIDRs are required, but this is already satisfied; not a step to establish the peering.
- ✗
Create a VPN attachment between the two VPCs using AWS Site-to-Site VPN.
Why it's wrong here
Inter-region VPC peering does not require VPN; it uses the AWS backbone.
- ✓
The owner of each VPC must accept the peering connection request.
Why this is correct
Both sides must accept the peering request for it to be active.
- ✗
Create two separate peering connections, one for each direction of traffic.
Why it's wrong here
A single peering connection allows bidirectional traffic.
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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.