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Question 55

Refer to the exhibit. An organization is sizing an Anypoint VPC for the non-production deployments of those Mule applications that connect to the organization's on-premises systems. This applies to approximately 60 Mule applications. Each application is deployed to two CloudHub workers. The organization currently has three non-production environments (DEV, SIT and UAT) that share this VPC. The AWS region of the VPC has two AZs.

The organization has a very mature DevOps approach which automatically progresses each application through all non-production environments before automatically deploying to production. This process results in several Mule application deployments per hour, using CloudHub's normal zero-downtime deployment feature.

What is a CIDR block for this VPC that results in the smallest usable private IP address range?

    Correct Answer: D

    The calculation must account for the three non-production environments (DEV, SIT, UAT), with each environment having 60 Mule applications, each deployed to two CloudHub workers. Given the AWS region has two Availability Zones and considering the zero-downtime deployment feature, the IP address requirement is: 60 applications * 2 workers per application * 3 environments * 2 for availability zones = 720 IP addresses. The smallest CIDR block that can accommodate this number of IP addresses is /22, which provides 1024 IP addresses. Therefore, the smallest usable private IP address range for this VPC is 10.0.0.0/22.

Discussion
lzrvsOption: D

The AZ information is misleading. It is only used for the HA feature and zero downtime deployment, but does not imply necessarily a larger number of IPs to account for. My count is: 60 apps * 2 workers/app * 3 env * 2 for Zero Downtime Deployment = 720 ips < 1024 ips

gilofernandesOption: D

60 mulapplications * 2 workers * 3 env * 2 AZ + 2 for network and broadcast= 722 Answer is D

madgeezerOption: D

60 Mule applications each application is deployed to 2 CloudHub workers - 60*2=120 3 non-production environments (DEV, SIT and UAT) - 120*3=360 The AWS region of the VPC has 2AZs - 360*2 = 720 zero-downtime deployment feature requires 50% additional - 360+720=1080