ANS-C01 Network Implementation Practice Question
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.)
⚠ Common exam trap
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.
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.
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.
- ✓
Set the VPC's 'enableDnsHostnames' attribute to true
Why this is correct
This enables instances to receive DNS hostnames.
- ✗
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
Why it's wrong here
The default DHCP option set already provides the VPC DNS server.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.