An organization is hosting a scalable web application using AWS. The organization has
configured internet facing ELB and Auto Scaling to make the application scalable. Which of the
below mentioned statements is required to be followed when the application is planning to host a
web application on VPC?

A.
The ELB can be in a public or a private subnet but should have the ENI which is attached to an
elastic IP.

B.
The ELB must not be in any subnet; instead it should face the internet directly.

C.
The ELB must be in a public subnet of the VPC to face the internet traffic.

D.
The ELB can be in a public or a private subnet but must have routing tables attached to divert the
internet traffic to it.

Explanation:
The Amazon Virtual Private Cloud (Amazon VPC) allows the user to define a virtual networking
environment in a private, isolated section of the Amazon Web Services (AWS) cloud. The user
has complete control over the virtual networking environment. Within this virtual private cloud, the
user can launch AWS resources, such as an ELB, and EC2 instances. There are two ELBs
available with VPC:
internet facing and internal (private) ELB. For internet facing ELB it is required that ELB should be
in a public subnet.
After the user creates the public subnet, he should ensure to associate the route table of the
public subnet with the internet gateway to enable the load balancer in the subnet to connect with
the internet.
http://docs.aws.amazon.com/ElasticLoadBalancing/latest/DeveloperGuide/CreateVPCForELB.ht
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