- A
Set the VPC's 'enableDnsSupport' attribute to true
This enables DNS resolution through the Amazon DNS server.
- B
Set the VPC's 'enableDnsHostnames' attribute to true
This enables instances to receive DNS hostnames.
- C
Configure the Amazon Route 53 Resolver to forward queries to the VPC DNS
Why wrong: The VPC DNS server is already available; no need for Route 53 Resolver.
- D
Create a public hosted zone in Amazon Route 53 and associate it with the VPC
Why wrong: A public hosted zone is not needed for private DNS resolution.
- E
Create a custom DHCP option set with the domain-name-servers option set to the VPC DNS IP
Why wrong: The default DHCP option set already provides the VPC DNS server.
Question 906 of 1,705
VPC DNS Resolution Settings
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 setting up a new VPC and needs to ensure that instances in the VPC can resolve DNS names within AWS (e.g., ec2-203-0-113-25.compute-1.amazonaws.com). Which TWO configurations are required? (Select TWO.)
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
✓
Set the VPC's 'enableDnsSupport' attribute to true
Setting the VPC's 'enableDnsSupport' attribute to true (Option A) ensures that the VPC uses the Amazon-provided DNS server (the VPC DNS Resolver at the base VPC CIDR +2 address) to resolve DNS queries. This is required for instances to resolve public AWS DNS names like ec2-203-0-113-25.compute-1.amazonaws.com, as the VPC DNS Resolver handles both public and private DNS resolution within AWS.
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.
- ✓
Set the VPC's 'enableDnsSupport' attribute to true
Why this is correct
This enables DNS resolution through the Amazon DNS server.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Set the VPC's 'enableDnsHostnames' attribute to true
Why this is correct
This enables instances to receive DNS hostnames.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Configure the Amazon Route 53 Resolver to forward queries to the VPC DNS
Why it's wrong here
The VPC DNS server is already available; no need for Route 53 Resolver.
- ✗
Create a public hosted zone in Amazon Route 53 and associate it with the VPC
Why it's wrong here
A public hosted zone is not needed for private DNS resolution.
- ✗
Create a custom DHCP option set with the domain-name-servers option set to the VPC DNS IP
Common exam traps
Common exam trap: answer the scenario, not the keyword
The ANS-C01 exam often tests the misconception that enabling only 'enableDnsSupport' is sufficient, but the trap here is that 'enableDnsHostnames' must also be set to true for instances to receive and resolve public DNS hostnames, making both attributes required for the described scenario.
Detailed technical explanation
How to think about this question
The VPC DNS Resolver operates at the IP address 169.254.169.253 (or the base VPC CIDR +2) and is automatically enabled when 'enableDnsSupport' is true. The 'enableDnsHostnames' attribute (Option B) is also required because it assigns public DNS hostnames to instances with public IPs, which is necessary for resolving the ec2-* format names; without it, instances may not receive a public DNS name even if they have a public IP. In real-world scenarios, forgetting to set both attributes is a common cause of DNS resolution failures in new VPCs, especially when using services like AWS Systems Manager or custom scripts that rely on public DNS names.
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 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: Set the VPC's 'enableDnsSupport' attribute to true — Setting the VPC's 'enableDnsSupport' attribute to true (Option A) ensures that the VPC uses the Amazon-provided DNS server (the VPC DNS Resolver at the base VPC CIDR +2 address) to resolve DNS queries. This is required for instances to resolve public AWS DNS names like ec2-203-0-113-25.compute-1.amazonaws.com, as the VPC DNS Resolver handles both public and private DNS resolution within AWS.
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
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