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Security groups act as firewalls in your network. A security group defines which ports are open to allow incoming connections to a server. They are designed to control who can communicate (or initiate communication) with a server.
With the Network Manager, you can define multiple security groups within a network from a particular cloud provider. Your instances can access any security group that has been created in Network Manager. For example, if you create two different networks in AWS US-East, with their own security groups, your instances in US-East can access any of the security groups from both networks.
Note: You can assign multiple security groups in a cloud to a server. Permissions defined in a security group are additive in nature. So if a server has two security groups where one group has port 80 open and the other group has port 80 closed, port 80 will be open to the server.
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