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in this lesson Iamp;#39;m going to cover security groups and network ACLS these are both types of firewall that we can use on AWS to protect our ec2 instances and databases and other services that sit inside an Amazon VPC now firstly I need to cover the difference between what we call a state full and a state less firewall so here we have a web server on the left hand side and a client on the right hand side who wants to access that web service and you can see the IP addresses associated with these two different computers so what happens is because itamp;#39;s a web server itamp;#39;s going to listen on Port 80 thatamp;#39;s the well-known port for the unsecured version of HTTP so the connection goes over at Port 80 and thereamp;#39;s a source Port now the source Port is dynamically allocated by the operating system of the client and itamp;#39;s a high numbered Port so itamp;#39;s not one of the well-known ports which sit somewhere between uh 1 and 10,24 itamp;#39;s one of the
