You Have Deployed a Three-Tier Web Application in a VPC

question 491

Multiple Choice

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 Route53 for DNS Web (raffle 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 be the root caused? (Choose 2 answers)

• A) AWS 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
• B) The 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
• C) The ELB has scaled-up, adding more instances to handle the traffic spike, reducing the number of available private IP addresses for new instance launches
• D) AWS reserves one IP address in each subnet's CIDR block for Route53 so you do not have enough addresses left to launch all of the new EC2 instances
• E) AWS 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

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Definitions:

Collective Bargaining

The negotiation process between employers and a group of employees aimed at reaching agreements to regulate working salaries, working conditions, and other aspects of workers' compensation and rights.

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An event or condition that causes significant changes in the performance of the economy, affecting production, consumption, and distribution.

Mediator

An impartial individual or party that intervenes in a dispute or negotiation to help the conflicting parties reach an agreement.

Labor Unions

Organizations formed by workers to protect their rights and interests, typically focusing on issues related to wages, working conditions, and labor laws.