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Network Design →mediumMultiple ChoiceObjective-mapped

ANS-C01 Network Design Practice Question

This ANS-C01 practice question tests your understanding of network design. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 company is designing a VPC with multiple subnets across three Availability Zones. The application requires that all traffic between subnets within the same AZ stay within that AZ to minimize latency and data transfer costs. Which configuration achieves this?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.

A
Use a single route table for all subnets and add specific routes for each AZ.
Why wrong: Does not guarantee intra-AZ routing.
B
Use an AWS Transit Gateway with separate attachments for each AZ.
Why wrong: Transit gateway routes traffic centrally, not necessarily within the same AZ.
C
Create a VPC peering connection between subnets in the same AZ.
Why wrong: Unnecessary and doesn't control routing.
D
Create a route table for each AZ and associate the subnets in that AZ with the route table. Ensure the route tables have only local routes for the VPC CIDR.
Local routing within the same AZ is used.

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

✓

Create a route table for each AZ and associate the subnets in that AZ with the route table. Ensure the route tables have only local routes for the VPC CIDR.

Option D is correct because each Availability Zone (AZ) has its own route table with only the local VPC CIDR route. This ensures that traffic between subnets in the same AZ uses the VPC's local routing, which stays within the AZ's physical infrastructure, minimizing latency and avoiding cross-AZ data transfer costs. AWS VPC local routes inherently keep traffic within the same AZ when source and destination are in the same AZ, as the underlying network fabric directs traffic locally without traversing AZ boundaries.

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.

✗
Use a single route table for all subnets and add specific routes for each AZ.
Why it's wrong here
Does not guarantee intra-AZ routing.
✗
Use an AWS Transit Gateway with separate attachments for each AZ.
Why it's wrong here
Transit gateway routes traffic centrally, not necessarily within the same AZ.
✗
Create a VPC peering connection between subnets in the same AZ.
Why it's wrong here
Unnecessary and doesn't control routing.
✓
Create a route table for each AZ and associate the subnets in that AZ with the route table. Ensure the route tables have only local routes for the VPC CIDR.
Why this is correct
Local routing within the same AZ is used.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The ANS-C01 exam often tests the misconception that a single route table or a centralized service like Transit Gateway can achieve AZ-level traffic isolation, but the key is that local VPC routing inherently stays within the AZ only when the route table is per-AZ and contains only the local VPC CIDR, not when a shared route table or additional network appliances are introduced.

Detailed technical explanation

How to think about this question

Under the hood, AWS VPC uses a distributed router per AZ that handles local routing; when a route table has only the local VPC CIDR, the router forwards traffic directly within the AZ's physical network, leveraging the AWS Nitro system's local switching. This design ensures that traffic between subnets in the same AZ never leaves the AZ's data center, which is critical for applications like real-time data replication or high-frequency trading where microseconds matter. In a real-world scenario, a multi-AZ deployment for a latency-sensitive application like a financial trading platform would use per-AZ route tables to guarantee that all east-west traffic within an AZ stays local, avoiding the ~1-2 ms cross-AZ latency penalty.

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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.

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

What is the correct answer to this question?

The correct answer is: Create a route table for each AZ and associate the subnets in that AZ with the route table. Ensure the route tables have only local routes for the VPC CIDR. — Option D is correct because each Availability Zone (AZ) has its own route table with only the local VPC CIDR route. This ensures that traffic between subnets in the same AZ uses the VPC's local routing, which stays within the AZ's physical infrastructure, minimizing latency and avoiding cross-AZ data transfer costs. AWS VPC local routes inherently keep traffic within the same AZ when source and destination are in the same AZ, as the underlying network fabric directs traffic locally without traversing AZ boundaries.

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: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.

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.