Try 5 free practice questions with instant feedback. See how ready you are.
Question 1
What is the maximum number of VPCs you can create per AWS region by default?
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?
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?
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?
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?
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.