Exam AWS DevOps Engineer Professional topic 1 question 41 discussion

Exam question from Amazon's AWS DevOps Engineer Professional

Question #: 41
Topic #: 1

[All AWS DevOps Engineer Professional Questions]

A company has built a web service that runs on Amazon EC2 instances behind an Application Load Balancer (ALB). The company has deployed the application in us-east-1. Amazon Route 53 provides an external DNS that routes traffic from example.com to the application, created with appropriate health checks.
The company has deployed a second environment for the application in eu-west-1. The company wants traffic to be routed to whichever environment results in the best response time for each user. If there is an outage in one Region, traffic should be directed to the other environment.
Which configuration will achieve these requirements?
A.
✑ A subdomain us.example.com with weighted routing: the US ALB with weight 2 and the EU ALB with weight 1.
✑ Another subdomain eu.example.com with weighted routing: the EU ALB with weight 2 and the US ALB with weight 1.
✑ Geolocation routing records for example.com: North America aliased to us.example.com and Europe aliased to eu.example.com.
B.
✑ A subdomain us.example.com with latency-based routing: the US ALB as the first target and the EU ALB as the second target.
✑ Another subdomain eu.example.com with latency-based routing: the EU ALB as the first target and the US ALB as the second target.
✑ Failover routing records for example.com aliased to us.example.com as the first target and eu.example.com as the second target.
C.
✑ A subdomain us.example.com with failover routing: the US ALB as primary and the EU ALB as secondary.
✑ Another subdomain eu.example.com with failover routing: the EU ALB as primary and the US ALB as secondary.
✑ Latency-based routing records for example.com that are aliased to us.example.com and eu.example.com.
D.
✑ A subdomain us.example.com with multivalue answer routing: the US ALB first and the EU ALB second.
✑ Another subdomain eu.example.com with multivalue answer routing: the EU ALB first and the US ALB second.
✑ Failover routing records for example.com that are aliased to us.example.com and eu.example.com.

Show Suggested Answer

Suggested Answer: C

by rscloud at March 13, 2021, 9:28 p.m.

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Comments

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devopp

Highly Voted 3 years, 8 months ago

C is correct (reveal answer didnt show anything here)

upvoted 11 times

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Hoon_Lee

Most Recent 1 year, 1 month ago

C is answer

upvoted 1 times

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plpatankar

1 year, 7 months ago

B is correct as only latency based routing can provide best response time.

upvoted 2 times

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Dgix

1 year, 8 months ago

B. Option A: This option uses weighted routing which does not fulfill the requirement of routing traffic based on best response time. Option B: This option uses latency-based routing for subdomains which can route traffic based on best response time. It also uses failover routing for the main domain which can route traffic to the other environment in case of an outage. So, this option is correct. Option C: This option uses failover routing for subdomains which does not fulfill the requirement of routing traffic based on best response time. Option D: This option uses multivalue answer routing for subdomains which does not fulfill the requirement of routing traffic based on best response time.

upvoted 2 times

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Bulti

2 years, 5 months ago

C is the right answer. B isn't right as it sets up failover routing on example.com to first route to us.example.com and then to eu.example.com which is not how failover should be configured. Latency should be configured at example.com to route request to us or eu region based on the best response time for each user and this is done in C.

upvoted 1 times

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[Removed]

2 years, 5 months ago

B is correct. remember "best response time for user" is required. This configuration will achieve the company's requirements because it uses Route 53's latency-based routing feature to route traffic to the environment with the best response time for each user. It also uses Route 53's failover routing feature to automatically route traffic to the other environment in the event of an outage in one region.

upvoted 1 times

Kelevra1300

2 years, 4 months ago

I think C. Letter C has "✑ Latency-based routing records for example.com that are aliased to us.example.com and eu.example.com." which answers the requirement of "best response time for user"

upvoted 1 times

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saeidp

2 years, 6 months ago

C is correct

upvoted 1 times

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colinquek

2 years, 9 months ago

C initially was thinking B, but i think it is more common to put failover at DNS level. https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/dns-failover-configuring.html

upvoted 2 times

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