What is the maximum number of VPCs you can create per AWS region (by default)?

What is the purpose of route tables in a VPC?

You need your on-premises office network to securely connect to AWS VPC. Which service will you use?

Why is the first address in a subnet reserved as the network address and the last as the broadcast address?

Reserving the first address as network allows easy identification of the network, and the last address as broadcast is used to broadcast common messages to all devices in the network

You deleted the Internet Gateway from your VPC, but instances in the public subnet are still running. What will happen to their connectivity?