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diff --git a/content/notes/aws-solutions-architect/8.eni.md b/content/notes/aws-solutions-architect/8.eni.md new file mode 100644 index 0000000..eca1a88 --- /dev/null +++ b/content/notes/aws-solutions-architect/8.eni.md @@ -0,0 +1,27 @@ +--- +title: 08 - eni +course: ["aws solutions architect"] +--- + +# Elastic Netowrk Interfaces (ENI) + +https://aws.amazon.com/blogs/aws/new-elastic-network-interfaces-in-the-virtual-private-cloud/ + +ENIs are a virtual network card that give EC2 instances network access. + +Each ENI can have: + +1. a private iPV4 (or more) +2. one elastic IPv4 +3. one public IPv4 +4. security groups +5. a MAC address + +They are AZ bound and can be moved to other EC2 instances. + +> Network cards are a hardware component that allow computers to connect to networks +> ENIs are outside of the EC2 instance, although they affect them they just aren't shared by the instance + +Each EC2 instance has one network interface. + +Moving an ENI between instances allows for quick failover. |