To serve Web traffic for a popular product your chief financial officer and IT director have purchased 10 ml large heavy utilization Reserved Instances (RIs) evenly spread across two availability zones Route 53 is used to deliver the traffic to an Elastic Load Balancer (ELB) After several months, the product grows even more popular and you need additional capacity As a result, your company purchases two C3.2xlarge medium utilization Ris You register the two c3 2xlarge instances with your ELB and quickly find that the ml large instances are at 100% of capacity and the c3 2xlarge instances have significant capacity that’s unused Which option is the most cost effective and uses EC2 capacity most effectively?
A. Use a separate ELB for each instance type and distribute load to ELBs with Route 53 weighted round robin
B. Configure Autoscaning group and Launch Configuration with ELB to add up to 10 more on-demand mi large instances when triggered by Cloudwatch shut off c3
2xiarge instances
C. Route traffic to EC2 ml large and c3 2xlarge instances directly using Route 53 latency based routing and health checks shut off ELB
D. Configure ELB with two c3 2xiarge Instances and use on-demand Autoscailng group for up to two additional c3.2xlarge instances Shut on mi .large instances.
Correct Answer is A.
Ans is correct. The required normalization factor would be less than reserved.
A
The soon as two new C3.2xlarge instances are added to ELB, since these instances have larger compute than m1 large, then EBL moves the traffic to these new ones. Traffic should be separated by different ELB and controlled by weighted round robin.
https://www.ec2instances.info/?selected=c3.2xlarge
c3.2xlarge 15GIB/8VCPU
m1.large 7.7GIB/2VCPU
Answer should be A
https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/routing-policy.html#routing-policy-weighted
Weighted routing lets you associate multiple resources with a single domain name. For example, if you want to send a tiny portion of your traffic to one resource and the rest to another resource, you might specify weights of 1 and 255.
in this case, 10 instances goes through route with one weight and the other two with another configuration.
A. Use a separate ELB for each instance type and distribute load to ELBs with Route 53 weighted round robin