09. Public/Private EC2

Public/Private EC2

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Prerequisites

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1. Differnece between Public and Private EC2

Feature	Public EC2	Private EC2
Public IP	Yes	No
Internet Access	Direct	Via NAT
Inbound Access	Allowed	Not allowed
Subnet Type	Public	Private
Use Case	Web / Entry point	Backend / DB

1-1. Public EC2

• Has a public IP address
• Exists in a public subnet
• Has a route to Internet Gateway (IGW)

EC2 → Route Table → IGW → Internet
Internet → IGW → EC2

1-2. Private EC2

• Has no public IP
• Exists in a private subnet
• No direct route to IGW

EC2 → Route Table → NAT Gateway → IGW → Internet

👉 Outbound only

2. Public EC2

3. Private EC2