Your company has set up an application load balancer and various targets behind the ALB. But there are continuous problems at times wherein clients cannot connect to the ALB because of the whitelisting required to be done by the IT Security department. What changes can be made to the architecture to alleviate this problem?

Answer options:

A.Assign a public IP to the Application Load Balancer.
B.Assign an Elastic IP to the Application Load Balancer.
C.Place a Network Load balancer in front of the ALB.D.Place a Network Load balancer behind the ALB.

Answer – C
Since the IP of the Application Load balancer keeps on changing, the workaround is to have a Network Load balancer in front of the ALB. An elastic IP is then assigned to the Network Load balancer and in this way, the IP address won`t change.
Options A and B are incorrect because you can’t assign IP addresses to Application Load Balancers.
Option D is incorrect because it needs to be the other way around.
For more information on this scenario, one can visit the below URL
https://aws.amazon.com/blogs/networking-and-content-delivery/using-static-ip-addresses-for-application-load-balancers/