Why is it that an NLB in AWS does not require a Security Group?

Question

Is it necessary to associate the security Group with CLB and ALB Load Balancers in AWS? Why does NLB does not require a Security Group?

Answer 1

 NLB and NAT gateway both don't have a Security Group. The major difference is that their network Interfaces have different Source and Destination check settings.

Now For ALB and for CLB, the source and destination check is 'true' and for NLB & NAT gateway it is 'false'. Also, they have the ability to check for whether to allow traffic or not.

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