How many Internet Gateways can you attach to a VPC?

Only ONE Internet Gateway (IGW) can be attached to a VPC at a time.

What is the limit on the number of route tables per VPC?

By default, an AWS VPC can have up to 200 route tables. This limit can be increased through AWS Service Quotas if needed.

How many security groups can you create per VPC?

By default, you can create up to 2,500 Security Groups per VPC. This quota can be increased through AWS Service Quotas if required.

What is the maximum number of rules per security group?

By default, an AWS Security Group supports 60 inbound rules and 60 outbound rules. The quota can be increased through AWS Service Quotas if required.

How do public and private subnets differ in AWS VPC?

Public subnets provide direct internet access through an Internet Gateway, while private subnets isolate resources from direct internet access and use NAT Gateway for outbound connectivity when needed.