Network concepts and Programming from Scratch – Udemy Discount Coupon

This course is about strengthening the Networking concepts and fundamentals with assignments and projects side by side with theory. Through this course you will be able to :

1. Understand the Functioning of TCP/IP Stack (OSI Model). Understand the function of each layer in TCP/IP stack in good detail.

2. Explain the L2 routing concepts – Mac Addresses and ARP

3Explain the L3 routing concepts – IP Addresses and IP protocol

4. Understand various ways to design a Linux TCP/UDP server program in C

5. Understand Socket programming in C

6. Understand the Networking devices functioning – L2 switch and L3 router

7. Understand packet Journey through the layers of TCP/IP stack

8. Design and implement HTTP Webservers from scratch

9. Read and manufacture the network packets from scratch

10. Do various coding assignments and projects to hands-on the concepts

11. Wheel Timers as a periodic packet dispatchers

12. Understand the concept of TLVs

We Understand – Networking by its nature is inclined towards being a theoretical subject of study. To arouse the interest of the students ,we elaborate each and every topic of this course through an assignment or project.

This course is backed by two Networking projects where we explain the problem statement with description in detail and guide the student from the beginning of the project towards completion of the project. The projects are  completely in line with the concepts and Demos shown and taught in the course.

This course is thorough and completely coding based. We explain the design, discuss the code flow and then guide the audience how to implement the particular concept design in detail in a step by step manner. All you need is a Linux OS running on your system to do this course.

Who should do this course ?

This course is meant for UG Computer science students, job seekers and professional developers. This is MUST do course for those who want to join MNCs as a developer. The topics covered in this course are of utmost importance from interviews aspects and students graduating in computer science and looking to seek an opportunity in MNCs as a developer should have Networking concepts at his/her finger tips.

Better to have done Networking under graduate course, not mandatory.

Job seekers trying for the position of Networking developers in product based MNCs

System software development including Networking is an evergreen area. Internet will not going to be doomed ever.


There is no pre-requisite for this course, however, it shall be advantage if you know a little of C. We designed this course assuming student is a complete beginner in Networking and we raise the level of course gradually as we move from Basic to advance Networking concepts.

Also, Please just do not sit and watch my codes. Write your own codes, even if it is same as mine !

We have a strong reasons to choose C as a language for this course:

1. The entire core networking development work is being done in C in industry. So, this reason alone is good enough that you should learn network development in C if you are aiming to join industry as a network protocol developer.

2. Network equipment need to interact with underlying hardware – the ASIC chips. What could be a better language other than C when it comes to interact and program the hardware.

3. C is middle level language – not as low as assembly, neither as high as Java/Python. In C, its the programmer’s responsibility to write every line of code to get the task done, unlike Java/Python which provides rich rest of libraries to do the most tasks for you. Using High Level Languages for learning network programming would obscure the low level details of networking – that is what is going behind the scenes. If you are are beginner in network programming, you must learn things from scratch and only C provides you the opportunity to do that. So, you must do all your assignments in C.

4. Networking is all about cooking up the packets and sending it out of wire. C will allow you to cook packets exactly the same way as you would like them to appear on wire. Lot of Bit level programming.

5. If you are a beginner in Networking, pls refrain from learning network programming in High Level Languages such as Java Or Python. It is not job oriented thing to do in networking domain.

No Third Party libraries

Whatever logic you implement, you need to implement it from scratch. This course do not suggest taking help of any third party library to get the jobs done. Use of external libraries completely defeats the purpose of the course. However, it is recommended to use third party libraries for commonly used data structures such as linked lists/Trees/Queues etc which saves a lot of time implementing these data structures.


0. Setting up Linux Development Environment on your machine 

  • For those who are not familiar with Linux Installation/environment

1. OSI Model Vs TCP/IP Stack

  • Data Encapsulation and Data Decapsulation
  • Headers Cascading
  • Ingress and egress Journey of packet through a TCP/IP Stack
  • Big Picture

2. Multi-node setup environment on your machine

  • Setup Multinode Cluster of Virtual machines on your machine
  • Local and Remote Subnets
  • Layer 3 Route Semantics
  • Configure Layer 3 routes in nodes
  • Understand L3 Routing table semantics

3. Subnetting and IP address

  • Understand Subnets
  • Differentiate between local and remote subnets
  • IP Address assignment scheme/policy
  • Data Delivery
  • Understand MAC addresses and their use
  • Calculation of Networking ID, Broadcast address and Cardinality of a subnet
  • Understand the relationship between L3 routers and Subnets
  • Understand Point-to-Point links
  • MAC layer and IP rules of packet rejection/acceptance
  • Broadcast Addresses

4. Layer 2 Networking concepts

  • L3 Router as a gateway to subnet
  • Protocol Identifier fields at each layer
  • Ethernet header format
  • How Ethernet hdr makes L2 routing possible
  • ARP (Address resolution protocol)
  • ARP table population and use
  • Step by Step ARP protocol functioning
  • Assignment on ARP
  • Layer2 Switch – How it works
  • MAC address table
  • Step by Step description of L2 Switch functioning
  • Problem of Layer Thrashing

5. Layer 3 Networking concepts

  • Relationship between Layer2 and Layer3 routing
  • Explained the dependency of two layers over each other
  • Configuring Layer 3 routing table
  • Semantics of a Layer 3 route
  • Layer 3 route look up
  • Concept of Longest prefix match
  • IP Header – fields you should know
  • Network Layer Operations
  • Step by Step description of L3 routing routing
  • Loopback interface – purpose and configuring loopback interface
  • Exercise on Layer 3 route installation, routing and forwarding of traffic

6. Network troubleshooting tools

  • How ping works – ICMP protocol description
  • Networking applications troubleshooting utilities – ping, wireshark, tcpdump
  • Capturing the packets and examine its contents using tcpdump

7. Transport Layer

  • Layer Goals
  • Contrasting Layer2, Layer 3 and Layer 4 together
  • TCP Vs UDP
  • Concept of Headers stacking
  • Concept of port numbers
  • Linux System call interface

8. Socket programming concepts

  • Socket Programming Design
  • Select System call
  • Accept System call
  • Concept of Multiplexing
  • Server State machine

9. Application Layer 

  • Different ways to implement Sockets
    • on Top of Transport layer
    • on Top of Network Layer
    • on Top of  Data link layer
  • Designing HTTP Webserver from scratch
  • HTTP Webserver Implementation
  • Custom application sockets

10. Wheel Timers – Periodic Packet based Dispatchers

  • Wheel Timer Design
  • Implementation
  • Demonstration
  • Coding Assignment

11. Concept of TLVs

  • What are TLVs
  • Why we need TLVs
  • Writing a TLV decoder
  • Benefits of TLVs in Network communication
  • STREAMS – Data Structure
  • TLV (De)Serialization using STREAMS

12. Advance Networking Concepts (Will be added Later)

  • Ethernet sockets
  • Remote Procedure Calls
  • Network and Host Byte order
  • Big Endian and Little Endian
  • Net-filter Hooks
  • Concept of High Availability
  • Ancillary Data


1. Distributed Transparent Memory

  • Socket programming based project
  • Many nodes shared their local chunk of memory to form one big chunk of memory
  • Memory is distributed across nodes, but user is not aware of this distributed-ness (Transparent)
  • Such memory model is used when voluminous amounts of data needs to be stored on several machines
  • Example : Hadoop Distributed File System (HDFS) is built on this model

2.  Periodic packet dispatching using Wheel Timer

  • Schedule the events to be triggered in future
  • Schedule packet dispatching in future at regular time intervals
  • Schedule the action to perform when timers expires

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In Short

Networking course with fundamental concepts in depth with TCP/UDP/HTTP Socket Programming for beginners to expert