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Exam AWS Certified Solutions Architect - Professional SAP-C02 topic 1 question 155 discussion

Exam question from Amazon's AWS Certified Solutions Architect - Professional SAP-C02
Question #: 155
Topic #: 1
[All AWS Certified Solutions Architect - Professional SAP-C02 Questions]

A global media company is planning a multi-Region deployment of an application. Amazon DynamoDB global tables will back the deployment to keep the user experience consistent across the two continents where users are concentrated. Each deployment will have a public Application Load Balancer (ALB). The company manages public DNS internally. The company wants to make the application available through an apex domain.

Which solution will meet these requirements with the LEAST effort?

  • A. Migrate public DNS to Amazon Route 53. Create CNAME records for the apex domain to point to the ALB. Use a geolocation routing policy to route traffic based on user location.
  • B. Place a Network Load Balancer (NLB) in front of the ALMigrate public DNS to Amazon Route 53. Create a CNAME record for the apex domain to point to the NLB’s static IP address. Use a geolocation routing policy to route traffic based on user location.
  • C. Create an AWS Global Accelerator accelerator with multiple endpoint groups that target endpoints in appropriate AWS Regions. Use the accelerator’s static IP address to create a record in public DNS for the apex domain.
  • D. Create an Amazon API Gateway API that is backed by AWS Lambda in one of the AWS Regions. Configure a Lambda function to route traffic to application deployments by using the round robin method. Create CNAME records for the apex domain to point to the API's URL.
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Suggested Answer: C 🗳️
by zhangyu20000 at Jan. 16, 2023, 6:44 p.m.
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God_Is_Love
Highly Voted 1 year, 7 months ago
Selected Answer: C
No, an apex domain cannot use CNAME records in AWS. This is because of the way DNS resolution works. A CNAME record specifies an alias for a domain name, which points to the canonical name of another domain. However, the DNS standard does not allow CNAME records for apex domains, as they should only have A or AAAA records. When you try to create a CNAME record for an apex domain in AWS Route 53, you will receive an error message indicating that the record set type is not valid for the apex domain. To work around this limitation, you can use an alias record instead.
upvoted 22 times
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zhangyu20000
Highly Voted 1 year, 9 months ago
C is correct ABD all have CNAME record that is not allowed for apex domain
upvoted 10 times
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career360guru
Most Recent 10 months, 1 week ago
Selected Answer: C
Option C
upvoted 2 times
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yuliaqwerty
10 months, 2 weeks ago
C https://aws.amazon.com/blogs/networking-and-content-delivery/solving-dns-zone-apex-challenges-with-third-party-dns-providers-using-aws/
upvoted 3 times
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[Removed]
1 year ago
You can create alias record for apex domain in route 53 However the question is asking about least effort and the client is managing domain internally
upvoted 1 times
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Explorer_30
1 year, 1 month ago
The answer is C
upvoted 1 times
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NikkyDicky
1 year, 3 months ago
Selected Answer: C
C no CNAME for apex
upvoted 2 times
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SkyZeroZx
1 year, 4 months ago
Selected Answer: C
A , B no seems because reference geolocation D no seems because apex domain with API Gateway ? then C Global Accelerator is good option
upvoted 1 times
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chikorita
1 year, 4 months ago
fun fact: CNAME records does not support APEX domain which simply rules out the options with CNAME in it answer is C
upvoted 4 times
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mfsec
1 year, 7 months ago
Selected Answer: C
Create an AWS Global Accelerator accelerator with multiple endpoint groups that target endpoints in appropriate AWS Regions.
upvoted 3 times
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masetromain
1 year, 9 months ago
Selected Answer: C
C. Create an AWS Global Accelerator accelerator with multiple endpoint groups that target endpoints in appropriate AWS Regions. Use the accelerator’s static IP address to create a record in public DNS for the apex domain. This solution meets the requirements with the least effort because it uses AWS Global Accelerator, which automatically routes traffic to the optimal endpoint based on health and geography, eliminating the need for manual configuration or additional routing policies. It also eliminates the need to create a CNAME record for the apex domain to point to the ALB or NLB's IP address, which can be less efficient and less reliable.
upvoted 5 times
masetromain
1 year, 9 months ago
A. Migrate public DNS to Amazon Route 53. Create CNAME records for the apex domain to point to the ALB. Use a geolocation routing policy to route traffic based on user location. While this solution uses Route 53 and geolocation routing, it requires manual configuration and maintenance of the routing policy and could introduce additional latency as traffic is routed through the ALB first. B. Place a Network Load Balancer (NLB) in front of the ALB. Migrate public DNS to Amazon Route 53. Create a CNAME record for the apex domain to point to the NLB’s static IP address. Use a geolocation routing policy to route traffic based on user location. This solution is similar to the first one, but it uses a Network Load Balancer (NLB) instead of an Application Load Balancer (ALB). It has the same downsides as the first solution.
upvoted 1 times
masetromain
1 year, 9 months ago
D. Create an Amazon API Gateway API that is backed by AWS Lambda in one of the AWS Regions. Configure a Lambda function to route traffic to application deployments by using the round robin method. Create CNAME records for the apex domain to point to the API's URL. This solution uses Amazon API Gateway and AWS Lambda to route traffic, but the round-robin method is not the best way to ensure optimal performance and availability for a multi-region deployment. Additionally, routing traffic through a Lambda function can introduce additional latency. AWS Global Accelerator is a more efficient solution that automatically routes traffic to the optimal endpoint based on health and geography, eliminating the need for manual configuration or additional routing policies.
upvoted 1 times
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