Python Network Programming 2025

A weekly lab-based journey from classical sockets to future networks. Building one network agreement in Python every week—simple first, then fragile, then strange.

Course Philosophy

Networks are not cables and boxes. They are agreements under uncertainty. You already know IP addressing and routing. Now we program behavior.

Learning Path Overview

Week	Topic	Type	Core Concepts
1	Client–Server Communication (TCP Unicast)	BASIC	TCP sockets, bind, listen, accept, connect, request–response
2	UDP Communication (Connectionless Unicast)	BASIC	UDP sockets, datagrams, packet loss, no guarantees
3	Broadcast Communication	BASIC	LAN broadcast scope, discovery, service advertisement
4	Multicast Communication	BASIC	Group membership, multicast groups, selective delivery
5	Peer-to-Peer Networking	BASIC	Symmetric roles, dynamic ports, no central server
6	Ad-Hoc Networking (MANET Simulation)	BASIC	Neighbor discovery, routing, TTL, improvised networks
7	Store-and-Forward Communication	BASIC	Message queues, retry logic, persistent buffers
8	Opportunistic Routing	BASIC	Probability-based forwarding, encounter routing
9	Bio-Inspired Networking	ADVANCED	Pheromone routing, reinforcement learning, adaptive paths
10	Quantum-Inspired Networking	ADVANCED	No-cloning, one-time tokens, quantum-secure concepts

📋 Kanban: Implementation Checklist

✅ Completed Implementations

• Week 1: TCP Client–Server (server.py, server_threaded.py, client.py)
• Week 2: UDP Unicast (sender.py, receiver.py)
• Week 3: UDP Broadcast (broadcaster.py, listener.py)
• Week 4: UDP Multicast (sender.py, receiver.py)
• Week 5: Peer-to-Peer (peer.py)
• Week 6: MANET Phase-1 (node.py with random port support)
• Week 7: Store-and-Forward Phase-1 (node.py, message_queue.py)

🚧 In Progress / Planning

• Week 8: Opportunistic Routing implementation
• Week 9: Bio-Inspired Networking (pheromone routing)
• Week 10: Quantum-Inspired Networking (conceptual)

📦 Codebase Structure

networkprogramming2025/
├── week01-tcp-client-server-basic/
│ ├── server.py (TCP server)
│ ├── server_threaded.py (Multi-threaded server)
│ ├── client.py (TCP client)
│ ├── config.py (Configuration)
│ ├── logger.py (Logging)
│ └── test_concurrent.py (Unit tests)
├── week02-udp-unicast-basic/
│ ├── sender.py (UDP sender)
│ ├── receiver.py (UDP receiver)
│ └── config.py
├── week03-udp-broadcast-basic/
│ ├── broadcaster.py (Broadcast sender)
│ ├── listener.py (Broadcast receiver)
│ └── config.py
├── week04-udp-multicast-basic/
│ ├── sender.py (Multicast sender)
│ ├── receiver.py (Multicast receiver)
│ └── config.py
├── week05-peer-to-peer-basic/
│ ├── peer.py (P2P node)
│ └── config.py
├── week06-manet-basic/
│ ├── node.py (MANET node)
│ ├── config.py
│ └── phase-1-random-port/ (Random port variant)
│ ├── node.py
│ └── config.py
├── week07-store-forward-basic/
│ ├── node.py (Store-forward node)
│ ├── message_queue.py (Queue implementation)
│ ├── config.py
│ └── phase-1-random-port/ (Random port variant)
│ ├── node.py
│ ├── message_queue.py
│ └── config.py
└── workshop/
├── Curriculum- Network Programming 2025.md
└── [Lab guides and research notes]

Key Learning Outcomes by Week

WEEK 1 – TCP Unicast

• Understand TCP client–server architecture
• Implement blocking socket communication
• Relate TCP reliability to application behavior
• Traits: Structured thinking, protocol discipline

WEEK 2 – UDP Unicast

• Compare TCP vs UDP trade-offs
• Implement connectionless communication
• Observe and handle packet loss behavior
• Traits: Risk awareness, performance analysis

WEEK 3 – Broadcast

• Understand LAN broadcast scope
• Implement discovery mechanisms
• Real-world usage: DHCP, service discovery

WEEK 4 – Multicast

• Join multicast groups
• Differentiate multicast vs broadcast
• Opt-in group communication
• Real-world usage: Video streaming, pub/sub

WEEK 5 – Peer-to-Peer

• Build symmetric network roles
• Handle dynamic ports
• Real-world usage: File sharing, decentralized systems

WEEK 6 – Ad-Hoc Networking (MANET)

• Simulate neighbor discovery
• Implement forwarding with TTL
• Extension: AODV/OLSR concepts

WEEK 7 – Store-and-Forward

• Implement message queues
• Handle retry logic
• Extension: Persistent storage, delay-tolerant networks

WEEK 8+ – Advanced Topics

• Opportunistic routing (probability-based)
• Bio-inspired networking (pheromone routing)
• Quantum-inspired concepts (one-time tokens, secure messaging)

Getting Started

1. Navigate to any week* directory
2. Configure your environment in config.py
3. Run server/sender in one terminal
4. Run client/receiver in another terminal
5. Observe the network behavior

Example (Week 1):

python server.py
python client.py

Philosophy Note

If your program never fails, it's lying.

Networks are inherently uncertain. This curriculum teaches you to build programs that acknowledge failure, handle it, and communicate despite it.

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Current Status: Weeks 1-7 implemented with all core functionality. Weeks 8-10 ready for implementation."