- A
Place the web tier in public subnets with auto-assign public IP addresses disabled.
Why wrong: Instances need public IPs for direct internet access.
- B
Place the web tier in public subnets with auto-assign public IP addresses enabled.
Public subnets provide direct internet access with lowest latency.
- C
Place the web tier in private subnets and use a VPC endpoint for internet access.
Why wrong: VPC endpoints do not provide internet access.
- D
Place the web tier in private subnets and use a NAT gateway for internet access.
Why wrong: NAT gateway adds latency.
Question 22 of 1,705
ANS-C01 Network Implementation Practice Question
This ANS-C01 practice question tests your understanding of network implementation. 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 deploying a multi-tier web application across three Availability Zones in a VPC. The web tier must be highly available and scale based on CPU utilization. The database tier uses an Amazon RDS Multi-AZ DB instance. The web tier must have the lowest possible latency to the internet. Which configuration should be used for the web tier subnets?
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
✓
Place the web tier in public subnets with auto-assign public IP addresses enabled.
Option B is correct because placing the web tier in public subnets with auto-assign public IP addresses enabled ensures that each EC2 instance receives a public IPv4 address automatically, allowing direct internet access for low-latency communication. Public subnets have a route to an internet gateway, which provides the shortest path to the internet without additional hops. This configuration supports high availability across three Availability Zones and integrates with an Auto Scaling group based on CPU utilization.
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.
- ✗
Place the web tier in public subnets with auto-assign public IP addresses disabled.
Why it's wrong here
Instances need public IPs for direct internet access.
- ✓
Place the web tier in public subnets with auto-assign public IP addresses enabled.
Why this is correct
Public subnets provide direct internet access with lowest latency.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Place the web tier in private subnets and use a VPC endpoint for internet access.
Why it's wrong here
VPC endpoints do not provide internet access.
- ✗
Place the web tier in private subnets and use a NAT gateway for internet access.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The ANS-C01 exam often tests the misconception that private subnets with a NAT gateway provide lower latency than public subnets with an internet gateway, but the trap here is that NAT gateways introduce additional network hops and are unsuitable for inbound web traffic, making public subnets the correct choice for lowest latency internet-facing web tiers.
Detailed technical explanation
How to think about this question
Under the hood, an internet gateway performs 1:1 NAT for instances with public IPs, translating their private IPs to the public IP for outbound traffic and reverse for inbound, ensuring minimal overhead. In a multi-AZ deployment, each public subnet in its respective Availability Zone has a dedicated route to the internet gateway, enabling low-latency, zone-independent internet access. A real-world scenario where this matters is a global e-commerce platform where every millisecond of latency directly impacts conversion rates; using NAT gateways would add 1-2 ms per packet, which is unacceptable for latency-sensitive web tiers.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Visual reference
What to study next
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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: Place the web tier in public subnets with auto-assign public IP addresses enabled. — Option B is correct because placing the web tier in public subnets with auto-assign public IP addresses enabled ensures that each EC2 instance receives a public IPv4 address automatically, allowing direct internet access for low-latency communication. Public subnets have a route to an internet gateway, which provides the shortest path to the internet without additional hops. This configuration supports high availability across three Availability Zones and integrates with an Auto Scaling group based on CPU utilization.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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.
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