The key difference between a Public Subnet and a Private
Subnet in a Virtual Private Cloud (VPC) primarily revolves around accessibility
and routing. Here’s a breakdown:
Public Subnet
- Accessibility: Instances in a public subnet can
communicate directly with the internet.
- Routing: The route table for a public subnet has a route
to an internet gateway (IGW), allowing outbound and inbound internet traffic.
- Use Cases: Typically used for resources that need to be
accessed from the internet, such as web servers, load balancers, or application
servers.
Private Subnet
- Accessibility: Instances in a private subnet cannot
communicate directly with the internet. They can access the internet only
through a NAT (Network Address Translation) gateway or instance located in a
public subnet.
- Routing: The route table for a private subnet does not
include a route to an internet gateway. Instead, it may have a route to a NAT
gateway for outbound internet traffic.
- Use Cases: Generally used for resources that do not
require direct internet access, like databases, application servers, or backend
services.
Summary
- Public Subnet: Has internet access; typically contains
resources that need to be publicly accessible.
- Private Subnet: No direct internet access; used for
resources that should remain private and secure.
Would you like more information or examples related to
subnet configurations?
