Day 06 - Amazon VPC Fundamentals

Date: 2025-09-15 (Monday)
Status: “Done”

Lecture Notes

Networking Services on AWS

Amazon Virtual Private Cloud (VPC)

  • Amazon Virtual Private Cloud (Amazon VPC) allows you to launch AWS resources into a virtual network you define.

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  • A VPC exists within a single Region. When creating a VPC, you must define an IPv4 CIDR block (required) and optionally an IPv6 one.
  • The default limit is 5 VPCs per Region per Account.
  • Commonly used to separate environments such as Production, Development, and Staging.
  • To achieve full resource isolation, use separate AWS Accounts rather than multiple VPCs.

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Subnets

  • A subnet resides within one Availability Zone.
  • The subnet CIDR must be a subset of the parent VPC’s CIDR block.
  • AWS reserves 5 IP addresses in each subnet: network, broadcast, router, DNS, and future use.

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Reserved IP Addresses Example (10.0.0.0/24):

  • 10.0.0.0 - Network address
  • 10.0.0.1 - VPC router
  • 10.0.0.2 - DNS server
  • 10.0.0.3 - Reserved for future use
  • 10.0.0.255 - Broadcast address

Hands-On Labs

Lab 03 – Amazon VPC & Networking Basics

  1. Create VPC → 03-03.1
  2. Create Subnet → 03-03.2