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本题库由云计算狂魔微信公众号分享。 【SAA-C03助理级解决方案架构师认证】A company has a multi-tier

application that runs six front-end web servers in an Amazon EC2 Auto Scaling group in a

single Availability Zone behind an Application Load Balancer(ALB).A solutions architect

needs to modify the infrastructure to be highly available without modifying the application. Which architecture should the solutions architect choose that provides high availability?

A:Create an Auto Scaling group that uses three instances across each of two Regions

B:Modify the Auto Scaling group to use three instances across each of two Availability Zones

C:Create an Auto Scaling template that can be used to quickly create more instances in another Region

D:Change the ALB in front of the Amazon EC2 instances in a round-robin configuration to balance traffic to the web

答案:B

题目解析:

High availability can be enabled for this architecture quite simply by modifying the existing Auto Scaling group to use multiple availability zones.The ASG will automatically balance the load so you don't actually need to specify the instances per AZ.The architecture for the web tier will look like the one below:CORRECT:"Modify the Auto Scaling group to use four instances across each of two Availability Zones" is the correct answer.INCORRECT:"Create an Auto Scaling group that uses four instances across each of two Regions" is incorrect as EC2 Auto Scaling does not support

multiple regions.INCORRECT:"Create an Auto Scaling template that can be used to quickly create more

instances in another Regir "is incorrect as EC2 Auto Scaling does not support multiple regions.

INCORRECT: "Create an Auto Scaling group that uses four instances across each of two subnets" is incorrect as the subnets could be in the same