- A
NAT gateway
Why wrong: NAT gateway provides outbound internet access for private subnets, not inbound.
- B
Virtual private gateway
Why wrong: Virtual private gateway is for VPN connections.
- C
Internet gateway
An internet gateway is required for internet traffic to reach resources in a VPC.
- D
Transit gateway
Why wrong: Transit gateway is for interconnecting networks.
Question 861 of 1,705
ANS-C01 Network Design Practice Question
This ANS-C01 practice question tests your understanding of network design. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 web application on EC2 instances behind an Application Load Balancer (ALB) in a VPC. The application must be accessible from the internet. Which component must be attached to the VPC to allow internet traffic to reach the ALB?
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
✓
Internet gateway
An Internet Gateway (IGW) is a horizontally scaled, redundant component that allows communication between a VPC and the internet. For an Application Load Balancer (ALB) to receive traffic from the internet, the ALB must be deployed in public subnets, and those subnets must have a route table entry pointing 0.0.0.0/0 to an IGW. Without the IGW, the ALB cannot accept inbound connections from the internet.
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.
- ✗
NAT gateway
- ✗
Virtual private gateway
- ✓
Internet gateway
Why this is correct
An internet gateway is required for internet traffic to reach resources in a VPC.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Transit gateway
Why it's wrong here
Transit gateway is for interconnecting networks.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the NAT gateway (which provides outbound-only internet access) with the Internet Gateway (which provides bidirectional internet access), leading them to select the NAT gateway for inbound traffic scenarios.
Detailed technical explanation
How to think about this question
Under the hood, the IGW performs network address translation (NAT) for instances with public IPs, but for an ALB, the IGW simply routes packets to the ALB's elastic network interface (ENI) in the public subnet. A common subtlety is that the ALB itself does not have a public IP; instead, the ALB's DNS name resolves to the public IPs of the IGW, which then forwards traffic to the ALB's private IPs. In a real-world scenario, if the route table for the ALB's subnet does not have a default route to the IGW, the ALB will be unreachable from the internet even if it has a public subnet association.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
Visual reference
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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: Internet gateway — An Internet Gateway (IGW) is a horizontally scaled, redundant component that allows communication between a VPC and the internet. For an Application Load Balancer (ALB) to receive traffic from the internet, the ALB must be deployed in public subnets, and those subnets must have a route table entry pointing 0.0.0.0/0 to an IGW. Without the IGW, the ALB cannot accept inbound connections from the internet.
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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