The correct answer is that the owner of each VPC must accept the peering connection request. This is required because inter-region VPC peering, like intra-region peering, operates on a mutual agreement model where both sides must explicitly accept the request to establish the connection; AWS does not automatically approve cross-account or cross-region peering. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this concept tests your understanding of the VPC peering lifecycle, specifically that acceptance is a distinct step separate from creating the request, and a common trap is assuming the requester’s acceptance alone suffices. Remember that VPC peering is a one-to-one relationship requiring bilateral consent—think of it as a handshake where both parties must grasp. A useful memory tip is “two owners, two accepts,” reinforcing that each VPC owner must independently approve the peering for traffic to flow.
ANS-C01 Network Implementation Practice Question
This ANS-C01 practice question tests your understanding of network implementation. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
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?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "primary"
Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
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.
For inter-region VPC peering, the owner of each VPC must accept the peering request. Option A is wrong because VPC peering does not use a VPN connection. Option B is wrong because the CIDR blocks are already non-overlapping. Option D is wrong because the peering connection is a single entity; you do not create two separate connections.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Create two separate peering connections, one for each direction of traffic.
Why it's wrong here
A single peering connection allows bidirectional traffic.
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
CIDR notation defines the prefix length.
Block size helps identify subnet boundaries.
Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
The required host count determines the smallest suitable subnet.
TExam Day Tips
→Write the block size before choosing the subnet.
→Check whether the question asks for hosts, subnets or a specific address range.
→Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Real-world example
How this comes up in practice
A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
What to study next
Got this wrong? Here's your next step.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related ANS-C01 subnetting questions on CIDR, address ranges, and subnet selection.
Network Implementation — This question tests Network Implementation — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: The owner of each VPC must accept the peering connection request. — For inter-region VPC peering, the owner of each VPC must accept the peering request. Option A is wrong because VPC peering does not use a VPN connection. Option B is wrong because the CIDR blocks are already non-overlapping. Option D is wrong because the peering connection is a single entity; you do not create two separate connections.
What should I do if I get this ANS-C01 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related ANS-C01 subnetting questions on CIDR, address ranges, and subnet selection.
Are there clue words in this question I should notice?
Yes — watch for: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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