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Network ImplementationhardMultiple ChoiceObjective-mapped

ANS-C01 Network Implementation Practice Question

Exhibit

Refer to the exhibit.

```
# AWS CLI output: describe-vpc-endpoint-services
{
    "ServiceNames": [
        "com.amazonaws.vpce.us-east-1.vpce-svc-0123456789abcdef0"
    ],
    "ServiceDetails": [
        {
            "ServiceName": "com.amazonaws.vpce.us-east-1.vpce-svc-0123456789abcdef0",
            "ServiceId": "vpce-svc-0123456789abcdef0",
            "ServiceType": [
                {
                    "ServiceType": "Interface"
                }
            ],
            "AvailabilityZones": ["us-east-1a", "us-east-1b"],
            "Owner": "123456789012",
            "PrivateDnsName": "example.com",
            "VpcEndpointPolicySupported": true,
            "AcceptanceRequired": true,
            "ManagesVpcEndpoints": false,
            "BaseEndpointDnsNames": ["vpce-0123456789abcdef0-us-east-1a.vpce.amazonaws.com"]
        }
    ]
}
```

A network engineer created a VPC endpoint for the service shown in the exhibit. The endpoint is in the 'available' state, but instances in the VPC cannot resolve the private DNS name 'example.com'. What is the most likely cause?

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

The endpoint does not have 'Private DNS names enabled'

The private DNS name is only resolved via Route 53 private hosted zone if 'Private DNS names enabled' is set. The exhibit shows the service has a PrivateDnsName, but the endpoint must have 'Private DNS names enabled' for resolution to work.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

  • The VPC does not have a Route 53 private hosted zone for example.com

    Why it's wrong here

    The endpoint can automatically manage private DNS if enabled; a private hosted zone is not required separately.

  • The VPC does not have an internet gateway

    Why it's wrong here

    Internet gateway is not needed for endpoint private DNS resolution.

  • The endpoint does not have 'Private DNS names enabled'

    Why this is correct

    Without enabling this option, the private DNS name is not resolved.

  • The security group for the endpoint is blocking DNS traffic

    Why it's wrong here

    Security groups do not affect DNS resolution; they affect traffic to the endpoint.

Visual reference

Client Recursive Resolver Root DNS (13 root servers) TLD DNS (.com, .org, …) Authoritative example.com query IP addr answer

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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.