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Question 1,047 of 1,705

Network Implementation →hardMultiple ChoiceObjective-mapped

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.

A
Ensure the VPC CIDR blocks do not overlap.
Why wrong: Non-overlapping CIDRs are required, but this is already satisfied; not a step to establish the peering.
B
Create a VPN attachment between the two VPCs using AWS Site-to-Site VPN.
Why wrong: Inter-region VPC peering does not require VPN; it uses the AWS backbone.
C
The owner of each VPC must accept the peering connection request.
Both sides must accept the peering request for it to be active.
D
Create two separate peering connections, one for each direction of traffic.
Why wrong: A single peering connection allows bidirectional traffic.

Full breakdown with real-world context →

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.

Option C is correct because 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.

Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

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.
Related concept
Read the scenario before looking for a memorised 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: answer the scenario, not the keyword

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.

Detailed technical explanation

How to think about this question

Under the hood, an inter-region VPC peering connection uses the AWS global infrastructure to route traffic between VPCs across regions, leveraging the AWS backbone without traversing the public internet. The peering connection is a networking construct that requires explicit acceptance from the accepter VPC owner, and once active, you must add routes in both VPC route tables pointing to the peering connection ID to enable bidirectional traffic. A common subtlety is that inter-region peering does not support transitive routing or edge-to-edge routing (e.g., through a VPN or internet gateway), so all traffic must be directly between the peered VPCs.

KKey Concepts to Remember

Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.

TExam Day Tips

Watch for words such as best, first, most likely and least administrative effort.
Review why wrong options are wrong, not only why the correct option is correct.

Key takeaway

Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

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.

Visual reference

What to study next

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this ANS-C01 question test?

Network Implementation — This question tests Network Implementation — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The owner of each VPC must accept the peering connection request. — Option C is correct because 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.

What should I do if I get this ANS-C01 question wrong?

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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?

Read the scenario before looking for a memorised answer.

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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.