Lecture Notes: Episode 6 - You Suck at Subnetting

Introduction

• Focus on using subnetting to secure and organize networks by splitting them into smaller networks.
• Episode is part of a series; prior episodes contain foundational knowledge.

Purpose of Subnetting

• To break up a home network into four smaller networks: wireless, IoT, DMZ, and user.
• Subnetting helps in managing network security and efficiency.

Why Subnetting Matters

• Allows better network organization.
• Essential skill for IT professionals.
• Sponsored encouragement to learn IT skills with IT Pro TV.

Understanding Subnetting

• Subnet Mask: Key to understanding networks.
  • Network bits (ones) and host bits (zeros).
• Convert subnet mask to binary to unlock its secrets.

The Process of Subnetting

1. Objective: Create four networks from one by manipulating the subnet mask.
2. Steps:
   • Need to flip host bits to network bits.
   • Use binary conversion to find the right number of bits to flip.
   • For four networks, require flipping two host bits.

Nosferatu and Nofortu Charts

• Nosferatu: Assists with decimal-to-binary conversion.
• Nofortu: Helps determine the number of bits required for a specific number of networks.

Practical Example

• Convert a given network to a subnet mask with four networks.
• Calculation: Two bits required to create four networks.
• New subnet mask in binary and then convert to decimal to get the subnet mask.

Calculating Increments

• Increment: Last network bit in binary (64 in decimal).
• Determines the range of addresses in each subnet.

Resulting Networks

• Example network ranges:
  • 192.168.1.0 - 192.168.1.63
  • 192.168.1.64 - 192.168.1.127
  • Etc.
• Each has a subnet mask of 255.255.255.192 or /26.

Quiz: Number of Hosts

• Formula: 2^(number of host bits) - 2 = number of usable addresses.
• Example: 6 host bits give 62 usable addresses.

Homework

• Task: Convert network to five subnets.
• Post results with subnet mask and ranges.

Final Remarks

• Subnetting is a critical IT skill.
• More advanced topics to follow in the series.
• Encouragement to use IT Pro TV for further learning.

Sponsor Mention

• IT Pro TV: Offers comprehensive courses on networking and subnetting.
• Discount code provided for learning resources.