Introduction & Transition from IPv4 to Subnetting

• Sharaf Ahmed Roble

1. Recap: Network vs Host (from Part I) 2. Problem of single network (broadcast domain) 3. Why subnetting is required in real networks

Basic Subnetting (Class C Practical)

• Sharaf Ahmed Roble

1. Subnet mask & CIDR (/24 → /26, /27) 2. Block size method 3. Network / Broadcast / Usable range - Practical 192.168.10.0/24 → 4 subnets

Subnetting Across Classes (A, B, C)

• Sharaf Ahmed Roble

1. Applying same method on different classes 2. Scaling subnetting - 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

Packet Tracer Implementation

• Sharaf Ahmed Roble

1. Assigning subnetted IPs 2. Network segmentation 3. Connectivity testing Practical Build topology (Router + LANs) Apply calculated subnets Test with ping

VLSM (Real-World Network Design)

• Sharaf Ahmed Roble

1. Why equal subnetting is inefficient 2. Variable Length Subnet Masking - Practical 10.10.0.0/16 200 hosts 50 hosts 20 hosts

Breakout Practical Exercise

• Sharaf Ahmed Roble

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

Solution Review & Error Correction

• Sharaf Ahmed Roble

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

Recap & Key Takeaways

• Sharaf Ahmed Roble

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