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📡 CS331 — Data Communications and Computer Networks

This course introduces the foundations of data communications and computer networks. It focuses on how data moves across networks, how communication is organized through the OSI and TCP/IP models, and how network layers, addressing, error control, and core devices work together in real systems.

This section contains structured study material for the course, including the overview page and your uploaded HTML study resource. The goal is to keep the course content clear, organized, and practical for both revision and project work.

🧭 How to Use This Section

Depending on where you are in the course, use this section differently.

If you are following the course, move through the topics in layer order, starting from the networking overview and physical layer, then continuing up through data link, network, transport, and application concepts. If you are revising, focus on the cheat sheet and the most important layered-model concepts, devices, and addressing ideas. If you are working on Packet Tracer or Wireshark tasks, use the layer-specific topics as references while you build and analyze network behavior.

🗂 Course Topics

  • 1⃣ Weeks 1-2 — Overview of Data Communications and Networking

    Basic communication concepts, network characteristics, network models, layered thinking, and the role of the Internet and modern computer networks.

  • 2⃣ Weeks 3-4 — Physical Layer

    Signals, transmission media, physical-layer communication concepts, and the foundational mechanisms that allow data to move between devices.

  • 3⃣ Weeks 5-8 — Data Link Layer

    Framing, error detection and correction, flow control, medium access, and Ethernet concepts across the data link subtopics covered in the course.

  • 4⃣ Week 9 — Interconnecting Devices

    Core networking devices and how they operate across layers, including how devices help forward, segment, and manage communication in real networks.

  • 5⃣ Weeks 15-17 — Network Layer

    Logical addressing, routing concepts, subnetting, packet delivery, and network-layer design decisions used to connect networks together.

  • 6⃣ Week 18 — Transport Layer

    End-to-end communication, segmentation, reliability, flow control, and transport services in TCP/IP-based communication.

  • 7⃣ Week 19 — Application Layer

    Network applications, service models, and the protocols users interact with most directly in practical networked systems.

  • 8⃣ Applied Work — Packet Tracer and Wireshark

    Practical network design, subnetting exercises, simulation work, and protocol analysis using tools such as Cisco Packet Tracer and Wireshark.

🌐 Core Learning Focus

The course is centered on understanding communication across layers rather than memorizing isolated facts. A big part of the learning is connecting abstract protocol models to real devices, real traffic, and real design choices. That includes explaining how services differ by layer, how network devices fit into the stack, and how subnetting and addressing support actual network requirements.

🛠 Lab and Project Work

This course includes hands-on work through network simulation and protocol analysis tools. The applied side of the course focuses on building network design solutions, calculating and applying subnet masks and addresses, and analyzing communication behavior using tools such as Packet Tracer and Wireshark.

🗒 Study Material

This section currently includes your uploaded HTML resource for revision:

More notes, summaries, and supporting material can be added here over time as the course content grows.

Step Topic
1 Networking overview and layered models
2 Physical layer foundations
3 Data link layer concepts and Ethernet
4 Interconnecting devices
5 Network layer and subnetting
6 Transport layer services
7 Application layer protocols
8 Cheat sheet, Packet Tracer, and Wireshark practice

About This Material

This page is based on the course syllabus and my own study organization. The focus is on clarity, structure, and practical understanding. Content can be expanded with notes, labs, and additional revision material over time.