Security Groups

Let's discuss creating security groups.

Security Groups are essentially firewalls, but work in the network-layer in AWS. Unlike a firewall in a server (e.g. iptables), they are not configured within a specific resource.

The default for Security Groups is to disallow all ingress (inbound) and egress (outbound) traffic.

A Security Group defines what types of traffic is allowed in/out of the server.

The video shows creating a Security Groups.

Note that how we create a security group in this video implicitly sets an egress rule to allow all outbound traffic - that's not explicitly shown in the web console.