ELASTIC NETWORK INTERFACES
- Logical component in a VPC that represents a virtual network card
- ENI has following attributes :
- Primary private IPv4 and one or more secondary IPv4
- One elastic (IP) IPv4 per private IPv4
- One public IP (IPv4)
- One or more security groups
- a MAC address
- ENIs can be created independently and attached on the fly to EC2 instances during failover.
- Bound to a specific AZ
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