Exam AWS-SysOps topic 1 question 546 discussion

A is correct. https://aws.amazon.com/blogs/networking-and-content-delivery/using-static-ip-addresses-for-application-load-balancers/ NLB enables static IP addresses for each Availability Zone. These static addresses don’t change, so they are good for our firewalls’ whitelisting. However, NLB allows only TCP traffic, no HTTPS offloading, and they have none of the nice layer 7 features of ALB.

A is correct https://aws.amazon.com/elasticloadbalancing/features/#Product_comparisons If extreme performance and static IP is needed for your application, we recommend that you use a Network Load Balancer.

https://aws.amazon.com/elasticloadbalancing/features If extreme performance and static IP is needed for your application, we recommend that you use a Network Load Balancer

With an ALB, you can associate a fixed Elastic IP address with the load balancer. This Elastic IP address can be shared with the external clients so that they can whitelist it in their firewalls. The ALB acts as a central entry point for the clients, and traffic is distributed across the EC2 instances behind it. The Network Load Balancer (NLB) is a layer 4 load balancer that operates at the connection level (TCP/UDP). It does not support assigning Elastic IP addresses directly to the load balancer.

A is correct

Perfect, nice link from Karmaah which clearly says NLB is the best option https://aws.amazon.com/blogs/networking-and-content-delivery/using-static-ip-addresses-for-application-load-balancers/

B can't be the right answer as the DNS result returned from route 53 for the ELB hostname will include a number of rotating ip addresses.

B is also correct base on the question.

A - NLB is correct answer - https://aws.amazon.com/elasticloadbalancing/features/#Product_comparisons

Correct Answer is A