Which statement is NOT true about a stack which has been created in a Virtual Private Cloud
(VPC) in AWS OpsWorks?
A.
Subnets whose instances cannot communicate with the Internet are referred to as public subnets.
B.
Subnets whose instances can communicate only with other instances in the VPC and cannot
communicate directly with the Internet are referred to as private subnets.
C.
All instances in the stack should have access to any package repositories that your operating
system depends on, such as the Amazon Linux or Ubuntu Linux repositories.
D.
Your app and custom cookbook repositories should be accessible for all instances in the stack.
Explanation:
In AWS OpsWorks, you can control user access to a stack’s instances by creating it in a virtual
private cloud (VPC). For example, you might not want users to have direct access to your stack’s
app servers or databases and instead require that all public traffic be channeled through an
Elastic Load Balancer. A VPC consists of one or more subnets, each of which contains one or
more instances. Each subnet has an associated routing table that directs outbound traffic based
on its destination IP address. Instances within a VPC can generally communicate with each other,
regardless of their subnet. Subnets whose instances can communicate with the Internet are
referred to as public subnets. Subnets whose instances can communicate only with other
instances in the VPC and cannot communicate directly with the Internet are referred to as private
subnets. AWS OpsWorks requires the VPC to be configured so that every instance in the stack,
including instances in private subnets, has access to the following endpoints:
The AWS OpsWorks service, https://opsworks-instance-service.us-east-1.amazonaws.com .
Amazon S3
The package repositories for Amazon Linux or Ubuntu 12.04 LTS, depending on which operating
system you specify.
Your app and custom cookbook repositories.
http://docs.aws.amazon.com/opsworks/latest/userguide/workingstacks-vpc.html#workingstacksvpc-basi cs