Lecture Notes: Subnetting by Sunny
Introduction
- Topic: Subnetting
- Definition: Logical subdivision of an IP network.
- Purpose:
- Relieve network congestion
- Improve network performance
- Enhance security
- Relevance:
- Important for network professionals
- Part of certifications like Kampuchea National Network Plaza
- Often made complex in textbooks, but this presentation simplifies it.
- Pre-requisites:
- Understanding subnet mask, network ID, host ID, and broadcast ID.
Example Problem
- Scenario: Create three subnets from a given network ID.
- Use Case: For a coffee shop (Sunny Café) with different subnets for office, front desk, storage, and public use.
- Task: List each subnet's network ID, subnet mask, host ID range, number of usable host IDs, and broadcast ID.
Building the Sunny Subnetting Table
- Purpose: Simplify subnetting questions.
- Structure:
- Row 1 (Subnets): 1, 2, 4, 8, 16, 32, 64, 128, 256 (each is double of the previous)
- Row 2 (Hosts): 256, 128, 64, 32, 16, 8, 4, 2, 1 (each is half of the previous)
- Row 3 (Subnet Masks): /24 to /32
Solving the Example
- Given: Network ID 192.168.4.0/24
- Objective: Create 3 subnets
- Process:
- Use 4 subnets column from Sunny Table (4 subnets cover the requirement)
- Subnets:
- Network IDs: 192.168.4.0, 192.168.4.64, 192.168.4.128, 192.168.4.192
- Subnet Mask: /26 for each
- Usable Hosts: 64 total - 2 (network and broadcast) = 62
- Broadcast IDs: 63, 127, 191, 255 (next network ID - 1)
- Host ID Ranges:
- 0-63
- 64-127
- 128-191
- 192-255
- Conclusion: Choose any 3 out of 4 subnets as required; 1 subnet is left unused.
Conclusion
- Challenges: Subnetting can seem tedious but becomes quick and simple with practice.
- Next Steps: Further explore subnetting of subnets in upcoming videos.
- Engagement: Viewers are encouraged to practice with provided example and reach out with questions.
Note: The lecture emphasizes the simplicity and effectiveness of the "Sunny Table" for subnetting tasks.