This project presents the design and implementation of a scalable enterprise Local Area Network (LAN) for a five-floor organization (TCN) using Cisco Packet Tracer.
The network supports secure departmental segmentation, inter-VLAN communication, centralized services, and Internet access while maintaining scalability and ease of management.
The design follows hierarchical network principles and uses VLANs, VLSM, trunking, DHCP, and Router-on-a-Stick routing.
- Five-floor enterprise building
- Over 100 workstations
- Department-level isolation
- Centralized routing and management
- Internal Web, DNS, and Email services
- Internet connectivity
- Scalable IP addressing
Topology: Extended Star (Hierarchical Design)
- Core Layer: Router (R1) + SW-GROUND
- Distribution Layer: Trunk aggregation on SW-GROUND
- Access Layer: Floor-level switches per department
Each department operates in its own VLAN, ensuring security and performance isolation.
| Department | VLAN ID | Subnet |
|---|---|---|
| Sales | 10 | 199.99.99.0/27 |
| Customer Support | 20 | 199.99.99.96/27 |
| Hardware | 30 | 199.99.99.160/27 |
| HR | 40 | 199.99.99.32/27 |
| Administration | 50 | 199.99.99.128/28 |
| Management / Servers | 99 | 199.99.99.144/28 |
- Base Network: 199.99.99.0/24
- Subnetting Technique: VLSM
- Default Gateway: Router sub-interfaces
- DNS Server: Web Server (199.99.99.146)
- Address Allocation: Router-based DHCP
This approach minimizes address waste and allows future expansion.
- Inter-VLAN Routing: Router-on-a-Stick
- Routing Type: Static routing
- Trunking: IEEE 802.1Q
- Switching: Cisco 2960 (Layer 2)
- Web Server: Internal website + DNS services
- Email Server: SMTP and POP3-based internal email
- Cloud-PT: Internet connectivity simulation
All servers are hosted in the Management VLAN (VLAN 99).
- Cisco 1941 Router
- Cisco 2960 Switches
- End devices (PCs)
- Cloud-PT device
- Copper straight-through and crossover cables
- Inter-VLAN ping tests
- Server reachability
- Internet connectivity
- DHCP address assignment validation
- Email communication testing
Screenshots are available in the screenshots/ directory.
- Full technical report:
report/ - Packet Tracer simulation:
packet-tracer/ - Presentation slides:
presentation/ - Additional design notes:
docs/
The project demonstrates a complete enterprise LAN design that is secure, scalable, and aligned with real-world networking practices.
It effectively integrates VLAN segmentation, efficient IP addressing, centralized routing, and automated configuration.
- MUHAMMAD HASSAN
- Computer Networks Project
- 3rd Semester - Fall'25