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Exam question from Amazon's ANS-C00

Question #: 2
Topic #: 1

You are building an application in AWS that requires Amazon Elastic MapReduce (Amazon EMR). The application needs to resolve hostnames in your internal, on-premises Active Directory domain. You update your DHCP Options Set in the VPC to point to a pair of Active Directory integrated DNS servers running in your
VPC.
Which action is required to support a successful Amazon EMR cluster launch?

A. Add a conditional forwarder to the Amazon-provided DNS server.
B. Enable seamless domain join for the Amazon EMR cluster.
C. Launch an AD connector for the internal domain.
D. Configure an Amazon Route 53 private zone for the EMR cluster.

Show Suggested Answer

Suggested Answer: A 🗳️

by Miguel at July 17, 2019, 7:19 p.m.

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lunt

Highly Voted 3 years, 7 months ago

Breakdown below in full. B. Nope. C. Nope. D. Nope. VPC Option set instructs EC2 instances/hosts. It does not make any changes to the VPC DNS configuration itself. This keeps the DNS server to default AmazonProvidedDNS. Private zone would be needed if I had a custom domain name. A. Yes. Create an outbound Route53 endpoint for resolver with required rules. Technically, if the EMR cluster was launched in a public subnet, then it would use the Internet Amazon DNS service, as the other options are not valid, this is a private subnet deployment. Standard text book response.

upvoted 12 times

sapien45

3 years, 3 months ago

There is no mention in the options of outbound Route53 endpoint , actually the question was created before that option even existed

upvoted 4 times

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2aldous

Highly Voted 3 years, 7 months ago

A. Please check this: https://aws.amazon.com/es/blogs/security/how-to-set-up-dns-resolution-between-on-premises-networks-and-aws-using-aws-directory-service-and-microsoft-active-directory/

upvoted 9 times

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awsleon

Most Recent 1 year, 7 months ago

Selected Answer: A

Since VPC DNS server is point to AD, EMR nodes need able to resolve AWS domains. So, a conditional forwarding is requirement for AWS domains.

upvoted 1 times

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PavanKushwah123

2 years, 5 months ago

Correct Answer B

upvoted 2 times

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CloudBourne

2 years, 5 months ago

Answer - A Explanation - Services that use the Hadoop framework, such as Amazon EMR, require instances to resolve their own fully qualified domain names (FQDN). In such cases, DNS resolution can fail if the domain-name-servers option is set to a custom value. To ensure proper DNS resolution, consider adding a conditional forwarder on your DNS server to forward queries for the domain region-name.compute.internal to the Amazon DNS server. For more information, see Setting up a VPC to host clusters in the Amazon EMR Management Guide. Source - https://docs.aws.amazon.com/vpc/latest/userguide/vpc-dns.html

upvoted 3 times

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Marty2021

2 years, 11 months ago

3 years, 7 months ago

It is A. https://aws.amazon.com/blogs/security/how-to-set-up-dns-resolution-between-on-premises-networks-and-aws-using-aws-directory-service-and-microsoft-active-directory/

upvoted 4 times

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tipzzz

3 years, 8 months ago

D is the correct answer : https://aws.amazon.com/fr/blogs/big-data/launching-and-running-an-amazon-emr-cluster-in-your-vpc-part-2-custom-dns/

upvoted 2 times

tipzzz

3 years, 7 months ago

it was a mistake, it's A

upvoted 2 times

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