Network Simulation

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📄 Network Documentation – Final Project

🌐 Objective
Create a network divided into three different subnets for clients, administrators, and servers, connected via a switch and a router, using VLANs for segmentation and Router-on-a-Stick for inter-VLAN communication.

🧩 Network Topology

  • 1️⃣ Central Switch

  • 1️⃣ Router 2911

  • 9️⃣ PCs:

    • 👨‍💻 3 Clients (PC0 – PC2)

    • 🛠️ 3 Administrators (PC3 – PC5)

    • 💾 3 Servers (PC6 – PC8)

🧠 VLAN and Subnet Division

NetworkVLANSubnetGateway
🧑‍💻 Clients10192.168.1.0/24192.168.1.1
🛠️ Admins20192.168.2.0/24192.168.2.1
💾 Servers30192.168.3.0/24192.168.3.1

🔌 Switch Port Assignment

  • fa0/1 to fa0/3: VLAN 10 (Clients)

  • fa0/4 to fa0/6: VLAN 20 (Admins)

  • fa0/7 to fa0/9: VLAN 30 (Servers)

  • fa0/10: Connection to router (trunk)

🔧 Switch Configuration

 
vlan 10 name CLIENTS vlan 20 name ADMINS vlan 30 name SERVERS interface range fa0/1 - 3 switchport mode access switchport access vlan 10 interface range fa0/4 - 6 switchport mode access switchport access vlan 20 interface range fa0/7 - 9 switchport mode access switchport access vlan 30 interface fa0/10 switchport mode trunk no shutdown

🚦 Router Configuration (Router-on-a-Stick)

interface g0/0.10 encapsulation dot1Q 10 ip address 192.168.1.1 255.255.255.0 interface g0/0.20 encapsulation dot1Q 20 ip address 192.168.2.1 255.255.255.0 interface g0/0.30 encapsulation dot1Q 30 ip address 192.168.3.1 255.255.255.0 interface g0/0 no shutdown

💻 PC IP Configuration

PCIP AddressSubnet MaskGatewayVLAN
PC0192.168.1.10255.255.255.0192.168.1.110
PC1192.168.1.11255.255.255.0192.168.1.110
PC2192.168.1.12255.255.255.0192.168.1.110
PC3192.168.2.10255.255.255.0192.168.2.120
PC4192.168.2.11255.255.255.0192.168.2.120
PC5192.168.2.12255.255.255.0192.168.2.120
PC6192.168.3.10255.255.255.0192.168.3.130
PC7192.168.3.11255.255.255.0192.168.3.130
PC8192.168.3.12255.255.255.0192.168.3.130

🔁 Connectivity Tests ✔️ Ping between PCs in the same VLAN
✔️ Ping between different VLANs (clients, admins, servers)
✔️ Ping to the gateways

Everything worked correctly in both real-time and simulation (after ARP resolution).

✅ Conclusion
This network is fully functional and securely segmented using VLANs. Thanks to the Router-on-a-Stick configuration, devices across different subnets can communicate properly. It’s a scalable structure suitable for adding services like:

  • DHCP

  • DNS

  • ACLs

  • Web Servers

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