What are aws security groups?
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See: http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-network-security.html for more information on Linux Security Groups.
See: http://docs.aws.amazon.com/AWSEC2/latest/WindowsGuide/using-network-security.html for more information on Windows Security Groups.
On a subnet you have Network ACLs to operate as a firewall.
On a AWS EC2 instances (the virtual machines), you have security groups to operate as the firewall. An EC2 has one or more security groups associated with it.
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