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Question 1 of 10
You have deployed a three-tier web application in a VPC with a CIDR block of 10.0.0.0/28. You initially deploy two web servers, two application servers, two database servers and one NAT instance tor a total of seven EC2 instances. The Web Application and database servers are deployed across two availability zones (AZs). You also deploy an ELB in front of the two web servers, and use Route 53 for DNS Web .Traffic gradually increases in the first few days following the deployment, so you attempt to double the number of instances in each tier of the application to handle the new load unfortunately some of these new instances fail to launch. Which of the following could the root caused? (Choose 2 answers)
AThe Internet Gateway (IGW) of your VPC has scaled-up adding more instances to handle the traffic spike, reducing the number of available private IP addresses for new instance launches.
BAWS reserves one IP address in each subnet’s CIDR block for Route 53 so you do not have enough addresses left to launch all of the new EC2 instances.
CAWS reserves the first and the last private IP address in each subnet’s CIDR block so you do not have enough addresses left to launch all of the new EC2 instances.
DThe ELB has scaled-up. Adding more instances to handle the traffic reducing the number of available private IP addresses for new instance launches
EAWS reserves the first four and the last IP address in each subnet’s CIDR block so you do not have enough addresses left to launch all of the new EC2 instances.