Question 1

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

Accepted Answer

5 VPCs per region by default, though this is a soft limit that can be increased by requesting a quota increase from AWS.

Question 2

What CIDR block size range is allowed when creating a VPC?

Accepted Answer

A VPC CIDR block must be between /16 (65,536 IP addresses) and /28 (16 IP addresses).

Question 3

How many IP addresses does AWS reserve in every subnet, and why?

Accepted Answer

AWS reserves 5 IP addresses in every subnet: the network address, VPC router, DNS server, future use, and broadcast address. These cannot be assigned to resources.

Question 4

What is the purpose of an Internet Gateway (IGW) in a VPC?

Accepted Answer

An Internet Gateway allows communication between instances in a VPC and the internet. It performs NAT for instances with public IPv4 addresses and is horizontally scaled and highly available.

Question 5

What makes a subnet 'public' in AWS?

Accepted Answer

A subnet is public when it has a route in its route table pointing to an Internet Gateway (0.0.0.0/0 → IGW) and instances have public or Elastic IP addresses.

AWS VPC & Networking – Solutions Architect Associate

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