You have a web application running on six Amazon EC2 instances, consuming about 45% of resources on
each instance. You are using auto-scaling to make sure that six instances are running at all times. The number
of requests this application processes is consistent and does not experience spikes. The application is critical
to your business and you want high availability at all times. You want the load to be distributed evenly between
all instances. You also want to use the same Amazon Machine Image (AMI) for all instances. Which of the
following architectural choices should you make?
A.
Deploy 6 EC2 instances in one availability zone and use Amazon Elastic Load Balancer.
B.
Deploy 3 EC2 instances in one region and 3 in another region and use Amazon Elastic Load Balancer.
C.
Deploy 3 EC2 instances in one availability zone and 3 in another availability zone and use Amazon Elastic
Load Balancer.
D.
Deploy 2 EC2 instances in three regions and use Amazon Elastic Load Balancer.
Explanation:
A load balancer accepts incoming traffic from clients and routes requests to its registered EC2 instances in one
or more Availability Zones.
http://docs.aws.amazon.com/ElasticLoadBalancing/latest/DeveloperGuide/how-elb-works.html Updated
Security Whitepaper link:
https://d0.awsstatic.com/whitepapers/aws-security-whitepaper.pdfhttps://media.amazonwebservices.com/pdf/AWS_Security_Whitepaper.pdf (page 8)
C
The request application is critical to your business and you want high availability at all times.
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I believe this question is tricky, while you need to focus on the actual 45% load, which 3 reamining instances could handle as well.
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C
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B and D are talking about REGIONs . So these are not correct ..
So correct one between A and C is C
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