General Question: How is my node syncing if my firewall is not open?

Basically I am setting up a stake pool on AWS and I have been following along with the tutorial here: Guide: How to build a Cardano Stake Pool - CoinCashew. I have reached the step where I have configured the topology files for both the relay and the BPN and ahve started the cardano node. I also configured my security group so that the two nodes can communicate with each other on port 6000 and nothing else (besides SSH on another port). How are both of these nodes getting the cardano blockchain data though? I have a feeling this is one of those glaring misunderstandings of how the network operates but please enlighten me.

Through OUT connection/peers

If u will cut the outgoing connections on fw u will see that the nodes won’t start anymore

Awesome thank you. But obviously im bringing data back in through the outgoing connection so I didnt know that was allowed honestly.

Out connections allow ur node to connect to other nodes
Incoming connections allow other nodes to stay connected to you

If u need datas from the network u will connect to other nodes in order to get them (out connections)

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