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Subnetting Made Easy

→ Africa/Mogadishu
Virtual (Zoom)

Virtual (Zoom)
Sharaf Ahmed (SomaliREN)
Description

Subnetting Made  Easy

Webinar Description

This webinar builds on the previous IPv4 addressing session by moving from theory to practical network design. It explains subnetting as a key technique for dividing large networks into smaller, manageable segments to improve performance, security, and scalability.

Participants will learn a simple and structured approach to identifying network ranges, broadcast addresses, usable hosts, CIDR notation, and subnet masks. The session also introduces VLSM, showing how different subnet sizes can be designed based on real network requirements to reduce IP waste and support growth.

Through practical demonstrations and real-world scenarios, learners will understand how subnetting is used in organizational and service provider networks. By the end of the session, participants will be able to apply subnetting and VLSM confidently in real network design.

 

Watch the recording on YouTube: https://youtu.be/VN54usvHEAE


Contact
    • 16:00 → 16:10
      Introduction & Transition from IPv4 to Subnetting 10m
      1. Recap: Network vs Host (from Part I)
      2. Problem of single network (broadcast domain)
      3. Why subnetting is required in real networks
      Speaker: Sharaf Ahmed Roble
      From-One-Big-Network-to-Many-The-Power-of-Subnetting.pdf
    • 16:10 → 16:25
      Basic Subnetting (Class C Practical) 15m
      1. Subnet mask & CIDR (/24 → /26, /27)
      2. Block size method
      3. Network / Broadcast / Usable range
        • Practical
          192.168.10.0/24 → 4 subnets
      Speaker: Sharaf Ahmed Roble
      subnetting sheet.xlsx
    • 16:25 → 16:40
      Subnetting Across Classes (A, B, C) 15m
      1. Applying same method on different classes
      2. Scaling subnetting
      3. Practical
        Class C: 192.168.20.0/24 → 8 subnets
        Class B: 172.16.0.0/16 → 4 subnets
        Class A: 10.0.0.0/8 → organizational design
      Speaker: Sharaf Ahmed Roble
    • 16:40 → 17:05
      Packet Tracer Implementation 25m
      1. Assigning subnetted IPs
      2. Network segmentation
      3. Connectivity testing
        Practical
        Build topology (Router + LANs)
        Apply calculated subnets
        Test with ping
      Speaker: Sharaf Ahmed Roble
    • 17:05 → 17:20
      VLSM (Real-World Network Design) 15m
      1. Why equal subnetting is inefficient

      2. Variable Length Subnet Masking

      3. Practical
        10.10.0.0/16
        200 hosts
        50 hosts
        20 hosts

      Speaker: Sharaf Ahmed Roble
    • 17:20 → 17:35
      Breakout Practical Exercise 15m

      Interactive (10 min)
      172.16.0.0/16
      Design multiple subnet sizes

      Speaker: Sharaf Ahmed Roble
    • 17:35 → 17:50
      Solution Review & Error Correction 15m

      Correct subnet allocation
      Common mistakes:
      Wrong block size
      Overlapping subnets
      Broadcast miscalculation

      Speaker: Sharaf Ahmed Roble
    • 17:50 → 18:00
      Recap & Key Takeaways 10m

      Summary
      Subnetting = network segmentation
      Improves performance, security, and scalability
      Foundation for real network design

      Speaker: Sharaf Ahmed Roble