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VPC summary (NAT instance (Manage by you, Use a script to manage failover,…

- - - - Create a size /20 default subnet (public subnet) in each AZ
      - CIDR block (172.31.0.0/16)
      - Auto Create Internet GW
      - Auto create default security group and NACL
      - default subnet receive both a public IPv4 address and a private IPv4 address, and both public and private DNS hostnames. Instances that you launch into a nondefault subnet in a default VPC don't receive a public IPv4 address or a DNS hostname
    - - ease to configure
- - - - and private subnet ec2 can only be access
- - - - Provide basic and auto failover