Exam AWS Certified Advanced Networking - Specialty ANS-C01 topic 1 question 73 discussion

The answer requires one to provide the IoT a single IP address. If you use NLB it gives you only one static (or EIP) per AZ. Thus resulting in multiple IP addreses. However a GA can provide a single front end IP to all the static (or EIP) addresses used by the NLB. Thus using an NLB alone is rulled out. Therefore the GA is the correct option. If the Q had stated that the applications where all in the same subnet then C would be correct. but it doesn't so this can't be assumed. See https://aws.amazon.com/elasticloadbalancing/network-load-balancer/

B, C, and D are also doable. Let's think about the cost. AWS Global Accelerator is definitely the best option. but it costs more money. NLB is enough. -> C.

C is the valid solution and most cost-efficient.

GA and NLB both provide static IPs. NLB can handle millions of connection request per second. GA is more for global connectivity which is not asked here. Hence, C is correct answer.

A - Not valid B, D - Do not need Global Accelerator C - Best cost effective solution.

D is very close but since it's not mentioning the users location hence C is correct

Also for users across region, how would NLB Work? I believe GA will solve that problem

I agree with Spike2020, Millions of users is NLB.

C, cost effective and also "The NLB automatically provides a static IP address for an AZ" so we can use them

Answer D C is valid but with millions of users, I side with D

C is the most cost effective