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VPC IN AWS - Coggle Diagram

- - - - or example, you can create an ENI in one subnet and then attach it to an instance as the primary ENI when you launch the instance
      - If you disable the Delete on Termination attribute of the ENI, you can terminate the instance without deleting the ENI.
      - An ENI can exist independently of an instance. You can create an ENI first and then attach it to an instance later
      - You can then associate the ENI with another instance
    - - Each instance must have a primary private IP address from the range specified by the subnet CIDR
      - he primary private IP address is bound to the primary ENI of the instance.
      - You can’t change or remove this address, but you can assign secondary private IP addresses to the primary ENI.
      - secondary addresses must come from the same subnet that the ENI is attached to
- - - - An Elastic IP address is a static IPv4 address designed for dynamic cloud computing. Within the AWS infrastructure, customers have virtual private clouds (VPCs).
    - - A Public IP address is how the internet identifies you. A public IP address is the IP address that communicates your internet connected device to the public internet.
      - A public IP address is the address that is assigned to a computing device to allow direct access over the Internet
- - - - Only one secondary IPv4 CIDR block can be added to each VPC by default.
      - The destination of the route for a subnet in the secondary CIDR block is the subnet CIDR block.
      - The subnet CIDR block must not be the same or larger than a destination CIDR block of a route in the VPC route table.
    - - Your primary CIDR blocks or CIDR blocks: 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16
      - CIDR blocks that are the same as or fall within reserved private CIDR blocks: 100.64.0.0/10, 214.0.0.0/7, 198.18.0.0/15 and 169.254.0.0/16
      - CIDR blocks that are the same as or fall within reserved public CIDR blocks: 0.0.0.0/8, 127.0.0.0/8, 240.0.0.0/4, and 255.255.255.255/32