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Question 173 - SCS-C02 discussion

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A company wants to configure DNS Security Extensions (DNSSEC) for the company's primary domain. The company registers the domain with Amazon Route 53. The company hosts the domain on Amazon EC2 instances by using BIND.

What is the MOST operationally efficient solution that meets this requirement?

A.
Set the dnssec-enable option to yes in the BIND configuration. Create a zone-signing key (ZSK) and a key-signing key (KSK) Restart the BIND service.
Answers
A.
Set the dnssec-enable option to yes in the BIND configuration. Create a zone-signing key (ZSK) and a key-signing key (KSK) Restart the BIND service.
B.
Migrate the zone to Route 53 with DNSSEC signing enabled. Create a zone-signing key (ZSK) and a key-signing key (KSK) that are based on an AWS. Key Management Service (AWS KMS) customer managed key.
Answers
B.
Migrate the zone to Route 53 with DNSSEC signing enabled. Create a zone-signing key (ZSK) and a key-signing key (KSK) that are based on an AWS. Key Management Service (AWS KMS) customer managed key.
C.
Set the dnssec-enable option to yes in the BIND configuration. Create a zone-signing key (ZSK) and a key-signing key (KSK). Run the dnssec-signzone command to generate a delegation signer (DS) record Use AWS. Key Management Service (AWS KMS) to secure the keys.
Answers
C.
Set the dnssec-enable option to yes in the BIND configuration. Create a zone-signing key (ZSK) and a key-signing key (KSK). Run the dnssec-signzone command to generate a delegation signer (DS) record Use AWS. Key Management Service (AWS KMS) to secure the keys.
D.
Migrate the zone to Route 53 with DNSSEC signing enabled. Create a key-signing key (KSK) that is based on an AWS Key Management Service (AWS KMS) customer managed key. Add a delegation signer (DS) record to the parent zone.
Answers
D.
Migrate the zone to Route 53 with DNSSEC signing enabled. Create a key-signing key (KSK) that is based on an AWS Key Management Service (AWS KMS) customer managed key. Add a delegation signer (DS) record to the parent zone.
Suggested answer: D

Explanation:

To configure DNSSEC for a domain registered with Route 53, the most operationally efficient solution is to migrate the zone to Route 53 with DNSSEC signing enabled, create a key-signing key (KSK) that is based on an AWS Key Management Service (AWS KMS) customer managed key, and add a delegation signer (DS) record to the parent zone. This way, Route 53 handles the zone-signing key (ZSK) and the signing of the records in the hosted zone, and the customer only needs to manage the KSK in AWS KMS and provide the DS record to the domain registrar. Option A is incorrect because it does not involve migrating the zone to Route 53, which would simplify the DNSSEC configuration. Option B is incorrect because it creates both a ZSK and a KSK based on AWS KMS customer managed keys, which is unnecessary and less efficient than letting Route 53 manage the ZSK. Option C is incorrect because it does not involve migrating the zone to Route 53, and it requires running the dnssec-signzone command manually, which is less efficient than letting Route 53 sign the zone automatically. Verified

Reference:

https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/domain-configure-dnssec.html

https://aws.amazon.com/about-aws/whats-new/2020/12/announcing-amazon-route-53-support-dnssec/

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asked 16/09/2024
Mellisa Stroman
38 questions
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