🌐 Computer Networks Lab

CSE 3712 (CSE 324) · United International University · Spring 2026

Subnetting · DHCP · Static & dynamic routing · RIP & OSPF · ACLs, built hands-on in Cisco Packet Tracer

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📌 About

This repository collects everything I built in the Computer Networks Lab this trimester: a term-project enterprise network, the mid and final practical exams, and my command cheatsheets. Every project is a working Packet Tracer file (.pkt) with its router configs exported as plain text, a topology diagram, and a README explaining the design.

🗂️ Projects

	Project	What it shows	Topology
01	Term Project: UIU Enterprise Network	6 routers, 6 switches, 32 hosts · 10.0.0.0 split into six /27 LANs and eight /30 WANs · RIP v2 + OSPF · DHCP on every LAN
02	Mid Exam: VLSM, DHCP, Static Routing	VLSM carving of 192.168.101.0/24 into /25, /26, /27 · hub-and-spoke · DHCP pools · static routes
03	Final Exam: RIP, DHCP, ACL	RIP v2 triangle across three LANs · extended ACL controlling ICMP to a server
04	Cheatsheet & command reference	Exam cheatsheet (PDF) and a full IOS command reference

📚 Course Coverage (12-week outline)

Week	Topic	Status	In this repo
1	Network lab intro, network components, TCP/IP properties	✅
2	IP addressing and subnetting	✅	applied in 01, 02
3	Packet Tracer intro, single-segment network	✅
4	Basic router configuration	✅	every project
5	DHCP · static and default routing	✅	02
6	Dynamic routing: RIP and OSPF	✅	01, 03
7	Midterm exam (practical)	✅	02
8	Basic firewalls: Access Control Lists	✅	03
9	Network Address Translation (NAT)	✅
10	Socket programming	✅
11	VLANs and inter-VLAN routing	⏭️ not covered this term
12	Final exam (practical)	✅	03

🧠 Skills Demonstrated

• Addressing: classful and classless subnetting, VLSM, /27 LAN and /30 point-to-point planning with no overlap
• Routing: static and default routes, RIP v2, OSPF (process IDs, router-IDs, wildcard masks, area 0), and how administrative distance picks between protocols
• Services: DHCP pools with custom gateway and DNS
• Security: extended ACLs, rule ordering, interface placement
• Design: meshed enterprise topologies with redundant paths, hub-and-spoke layouts
• Method: step-by-step verification with ping, show ip route, show ip protocols

▶️ Open the Projects

1. Install Cisco Packet Tracer 9.0 or newer (free through Cisco Networking Academy)
2. Open any .pkt file
3. Click a router → CLI tab → show running-config (or read the exported text in each configs/ folder)

📁 Repository Structure

Computer-Networks/
├── 01-term-project-enterprise-network/   .pkt · report · topology · configs/R1-R6
├── 02-mid-exam-vlsm-dhcp-static-routing/ .pkt · topology · configs/R1-R3
├── 03-final-exam-rip-dhcp-acl/           .pkt · topology · configs/R1-R3
└── 04-cheatsheet/                        PDF cheatsheet · command-reference.md

Note on the diagrams: topology images are generated directly from the .pkt files (devices, links, subnets, host counts) so they match the files exactly as submitted.

⚖️ Academic Integrity & Copyright

Published after the submission deadlines as a portfolio of my own work. If you are a student in this course, use it to understand the concepts, do not copy or submit it.

© 2026 Ahnaf Shahriar. Shared for viewing only; not licensed for reuse or resubmission.

👤 Author

Ahnaf Shahriar · CSE, United International University · GitHub