You can attach security groups to Application, Network, and Classic Load Balancers by assigning them during creation or via the console's 'Security' tab after creation to control inbound and outbound traffic [citation:1][citation:6].
You can attach security groups to Application, Network, and Classic Load Balancers to control the traffic allowed to reach them [citation:1][citation:6]. This is typically done when you create the load balancer. You can also change the attached security groups after creation by selecting the load balancer in the EC2 console, navigating to the 'Security' tab, and modifying the assigned groups.
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