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Exam AWS-SysOps topic 1 question 7 discussion

Exam question from Amazon's AWS-SysOps
Question #: 7
Topic #: 1
[All AWS-SysOps Questions]

Your application currently leverages AWS Auto Scaling to grow and shrink as load Increases/ decreases and has been performing well. Your marketing team expects a steady ramp up in traffic to follow an upcoming campaign that will result in a 20x growth in traffic over 4 weeks. Your forecast for the approximate number of Amazon EC2 instances necessary to meet the peak demand is 175.
What should you do to avoid potential service disruptions during the ramp up in traffic?

  • A. Ensure that you have pre-allocated 175 Elastic IP addresses so that each server will be able to obtain one as it launches
  • B. Check the service limits in Trusted Advisor and adjust as necessary so the forecasted count remains within limits.
  • C. Change your Auto Scaling configuration to set a desired capacity of 175 prior to the launch of the marketing campaign
  • D. Pre-warm your Elastic Load Balancer to match the requests per second anticipated during peak demand prior to the marketing campaign
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Suggested Answer: B 🗳️
by krishna2812 at May 2, 2021, 4:45 p.m.
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Boul
10 months ago
Answer is D. Predicted traffic surge due to an expected event can be handled by increasing the lbcu (load balancer capacity unit). The process is called pre-warming. Customer must put a request ahead of time
upvoted 1 times
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alxjandroleiva
1 year, 5 months ago
Selected Answer: B
It is clearly the B, if you increase the capacity 20x it means that you are below the quota of instances per region. If you do not modify the quota, you will not reach the necessary number of instances
upvoted 3 times
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Cyril_the_Squirl
2 years, 6 months ago
https://acloud.guru/forums/aws-certified-sysops-administrator-associate/discussion/-KKuVTO4jIXgLf3mQyxe/question-on-elb?answer=-KKvmFzqVNLzoQKZJeOD
upvoted 1 times
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Cyril_the_Squirl
2 years, 6 months ago
B is Correct. Navigate to: https://console.aws.amazon.com/trustedadvisor/home?#/category/service-limits You will seee that service limits are much lower, therefore it is guaranteed that your ASG will not achieve the anticipated target of 175 intances if you don't check and confirm...most importantly to ask AWS for increased service limit...forget about prewarming your ELB because ELBs are capable of handling large-scale volumes. 175 nodes is not considered large scale
upvoted 2 times
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JoellaLi
2 years, 6 months ago
D is the answer. As you can find this information on the AWS website: "Pre-Warming the Load Balancer Amazon ELB is able to handle the vast majority of use cases for our customers without requiring "pre-warming" (configuring the load balancer to have the appropriate level of capacity based on expected traffic). In certain scenarios, such as when flash traffic is expected, or in the case where a load test cannot be configured to gradually increase traffic, we recommend that you contact us to have your load balancer "pre-warmed". We will then configure the load balancer to have the appropriate level of capacity based on the traffic that you expect. We will need to know the start and end dates of your tests or expected flash traffic, the expected request rate per second and the total size of the typical request/response that you will be testing."
upvoted 1 times
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misako
2 years, 6 months ago
Correct answer is B. question states "steady ramp-up", then you don't need to pre-warm ELB
upvoted 2 times
Diegoflop
2 years, 6 months ago
Yes, I think the correct answer is B, too. AWS documentation said that Pre-warming it´s necessary when flash traffic expected.In this cases traffic steady ramp-up expected.
upvoted 1 times
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krishna2812
2 years, 7 months ago
D is perfect. :-)
upvoted 1 times
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