VPC and Subnets
A VPC (Virtual Private Cloud) is the virtual network where compute, databases, and load balancers live in AWS. If the shape of the VPC is not defined first, every decision inside it stays unstable.
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A VPC (Virtual Private Cloud) is the virtual network where compute, databases, and load balancers live in AWS. If the shape of the VPC is not defined first, every decision inside it stays unstable.
DNS, which resolves domain names to IPs, is one of the oldest pieces of internet infrastructure. AWS's managed DNS service is Route 53 — named after the standard DNS port (53).
AWS network firewalling has two layers: the Security Group (SG) attached to instances, and the Network ACL (NACL) attached to subnets. The names are similar, but the operating models differ quite a bit.