IP Subnetting & Router Configuration Simulation 🌐

This project demonstrates subnet planning and router interface configuration using Cisco Packet Tracer. A /24 network is logically divided into multiple subnets to support 4 LAN segments and 1 WAN link, ensuring organized IP distribution and communication readiness.

Course: Computer Networks (4th Semester)
Tool Used: Cisco Packet Tracer
Focus: IPv4 subnetting, address planning, router interface configuration

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🔧 Tools & Technologies

• Cisco Packet Tracer
• IPv4 Addressing & CIDR-based Subnetting
• Router CLI Configuration
• Binary subnetting & logical planning

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📂 Project Files

• IP-Subnetting-Simulation.pkt – Main simulation file (open in Cisco Packet Tracer)
• /assets/screenshots/ – Visual outputs including network layout and router configurations
• /report/Subnetting-Report.pdf – Full written report with subnet tables, IP assignments, and explanation

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🧪 What’s Demonstrated

✅ Subnetting Logic

• Divided 192.168.100.0/24 into:
  • 4 LAN subnets using /27
  • 1 WAN subnet using /30
• Ensured usable host count matches device requirements

🖧 Router Interface Configuration

• Assigned first usable IP to routers
• Activated interfaces using no shutdown
• Logical IP assignment for switches and PCs

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📘 Key Learning

• How to plan subnets using binary and CIDR notation
• Assigning IPs systematically across routers, switches, and hosts
• Structuring a simulation project with real-world addressing logic
• Verifying IP distribution and interface states using router CLI

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🧠 How Subnetting Works (Short Answer)

Subnetting splits a larger IP block into smaller, manageable segments. A router determines whether a destination IP is part of a known subnet by applying a bitwise AND between the destination IP and subnet mask. If the result matches a known network address in its routing table, the router forwards the packet to the correct interface; otherwise, it looks for alternative routes.

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📸 Screenshots

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📥 How to Run

1. Clone the repository:

   git clone https://github.com/Sameed-333/ip-subnetting-routing-simulation.git

2. Navigate to the project folder:

   cd ip-subnetting-routing-simulation

3. Open the simulation file: Launch IP-Subnetting-Simulation.pkt using Cisco Packet Tracer.
4. Explore the simulation:
   • View the full network topology and cabling.
   • Open the CLI on Router0 and Router1 and run:

     show ip interface brief
     show running-config

   • Assign or verify IPs on PCs and switches.
   • Use ping between devices to test reachability.
5. Review the Report:
   • Open the report file at: Subnetting-Report

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⚠️ Disclaimer

This project was created for educational purposes as part of a Computer Networks course. It is a simulation of subnetting design and router configuration using Cisco Packet Tracer.