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Exam ANS-C00 topic 1 question 77 discussion

Exam question from Amazon's ANS-C00

Question #: 77
Topic #: 1

A network engineer is deploying an application on an Amazon EC2 instance. The instance is reachable within the VPC through its private IP address and from the internet using an elastic IP address. Clients are connecting to the instance over the Internet and within the VPC, and the application needs to be identified by a single custom Fully Qualified Domain Name that is publicly resolvable `"`˜app.example.com'.
Instances within the VPC should always connect to the private IP to minimize data transfer costs.
How should the engineer configure DNS to support these requirements?

A. Use Amazon Route 53 to create a geo-based routing entry for the hostname 'app' in the DNS zone 'example.com'.
B. Create two A record entries for 'app' in the DNS zone 'example.com' ג€" one for the public IP and one for the private IP.
C. Use Route 53 to create an ALIAS record to the public DNS name for the instance.
D. Create a CNAME for 'app' in the DNS zone 'example.com' to the public DNS name for the Amazon EC2 instance.

Show Suggested Answer

Suggested Answer: D 🗳️

by walkwolf3 at Aug. 26, 2021, 2:09 p.m.

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Comments

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CCNPWILL

2 years, 8 months ago

Selected Answer: D

Agreed. need ALIAS. D

upvoted 1 times

CCNPWILL

2 years, 8 months ago

correction. CNAME*

upvoted 1 times

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khchan123

3 years, 3 months ago

D is correct. Route 53 alias does not support to EC2. https://aws.amazon.com/premiumsupport/knowledge-center/route-53-create-alias-records/ Be sure to use the correct DNS record type for IP addresses in the service you're pointing to: Amazon CloudFront distribution – A record (IPv4) or AAAA record (IPv6) AWS Elastic Beanstalk environment – A record (IPv4) Elastic Load Balancing (ELB) load balancer – A record (IPv4) or AAAA record (IPv6) Amazon Simple Storage Service (Amazon S3) bucket – A record (IPv4) Amazon API Gateway custom regional API and edge-optimized API – A record (IPv4) Amazon VPC interface endpoint – A record (IPv4) AWS Global Accelerator – A record (IPv4) Another Route 53 record in the same hosted zone

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ccieman2016

3 years, 5 months ago

D is correct, "application over EC2". There isn't support Alias to EC2.

upvoted 3 times

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eberhe900

3 years, 5 months ago

https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/resource-record-sets-choosing-alias-non-alias.html

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eberhe900

3 years, 5 months ago

the answer is C! https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/resource-record-sets-choosing-alias-non-alias.html

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learnwithaniket

3 years, 6 months ago

the zone apex must be an A Record, and not a CNAME record So, A record for example.com and CNAME record for app.example.com Hence answer is D.

upvoted 1 times

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walkwolf3

3 years, 8 months ago

C A. There is no geo location requirement. B. private doesn't need DNS name It's difficult to choose C and D, Alias and CNAME records are very similar. But from cost perspective, there is no charge for this case. So the answer is C Route 53 doesn't charge for alias queries to AWS resources. https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/resource-record-sets-choosing-alias-non-alias.html

upvoted 1 times

walkwolf3

3 years, 7 months ago

Change my answer to D. If a user sends out a DNS request for app.example.com, it will query example.com zone first, so create a CNAME in the zone example.com

upvoted 2 times

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