• Mastery of the Socket API for developing robust client-server applications in C/C++ or Python
• Develop a deep understanding of the TCP/IP stack as implemented within the UNIX kernel
• Equip learners with advanced network troubleshooting and performance tuning skills using standard UNIX utilities
• Introduce modern networking paradigms, including Network Function Virtualization (NFV) and Software-Defined Networking (SDN) in a UNIX context

Upon completion, learners will be able to:

1. Architect and implement concurrent network servers using various I/O models (Iterative, Preforked, Threaded, Non-blocking).
2. Diagnose complex network issues using packet sniffers (tcpdump, wireshark) and kernel-level tracing.
3. Configure advanced UNIX networking features such as IP Aliasing, Bonding, and Virtual Routing and Forwarding (VRF).
4. Secure network services using OpenSSL, Firewalls (iptables/nftables), and Secure Tunneling.
5. Automate network configuration and monitoring using Shell and Python scripting.

Module 1: The UNIX Network Architecture & Foundations

• The OSI and TCP/IP models from a UNIX perspective.
• Introduction to Network Interfaces and the /proc/net filesystem.
• Basic networking tools: ifconfig/ip, netstat/ss, and ping.
• Address Resolution Protocol (ARP) and the UNIX Routing Table.

Module 2: UNIX Socket Programming (C & Python)

• Socket types: Stream (TCP), Datagram (UDP), and Raw Sockets.
• The Socket Lifecycle: socket(), bind(), listen(), accept(), connect().
• Byte Ordering (Endianness) and Address Conversion.
• IPv4 vs. IPv6 programming and Dual-Stack support.

Module 3: Advanced I/O Models & Concurrency

• I/O Multiplexing: select(), poll(), and the high-performance epoll (Linux).
• Multi-process vs. Multi-threaded server designs.
• Non-blocking I/O and Signal-driven I/O.
• Introduction to Asynchronous Frameworks (e.g., Python’s asyncio).

Module 4: Network Services & Security

• Implementing and configuring DNS (BIND), DHCP, and SSH.
• Secure Socket Layer (SSL/TLS) integration using OpenSSL.
• UNIX Firewalls: Deep dive into nftables and Packet Filtering.
• Network Intrusion Detection Systems (NIDS) basics (e.g., Snort).

Module 5: Modern UNIX Networking & Cloud Integration

• Linux Namespaces and Virtual Ethernet (veth) pairs for Containers.
• Network Bridge configuration and Tunneling (GRE, VXLAN).
• Software Defined Networking (SDN) concepts and Open vSwitch (OVS).
• Capstone Project: Build a highly available, load-balanced web cluster using Nginx and Keepalived.

Project