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Computer Networking Fundamentals

IP addresses, subnets, DNS, TCP/UDP, Wi-Fi and troubleshooting explained simply with hands-on tools

Ghosla Academy · IT Infrastructure Team

Every app, website and cloud service depends on networking, yet many students only know that 'Wi-Fi is connected'. This course explains networks from the ground up: models, addressing, subnetting and the core protocols that make the internet work, using everyday Indian examples like hostel Wi-Fi and broadband routers. You will use real diagnostic tools on your own computer, read traffic in Wireshark, and finish with two projects: mapping your own network and documenting a structured troubleshooting process. It is ideal preparation for IT support, cloud and security roles.

What you will be able to do

  • Explain how data travels across networks using the OSI and TCP/IP models
  • Read IPv4 addresses, subnet masks and CIDR notation and calculate simple subnets
  • Describe how TCP, UDP, DNS, DHCP, ARP and NAT work
  • Use ping, traceroute, ipconfig/ip, nslookup and Wireshark to diagnose problems
  • Secure a Wi-Fi network and explain HTTPS, firewalls and VPNs
  • Plan a path into networking, support and cloud roles

What you build

  • Map and document your home or hostel network
  • Troubleshoot and document a network problem step by step

What you need to start

  • Basic computer and internet usage
  • A Windows, macOS or Linux computer for hands-on tools

Curriculum · 6 sections, 24 lectures

How networks work4 lectures
  1. What a network is and why it mattersFree preview8 min
  2. Network types, devices and topologiesFree preview10 min
  3. The OSI and TCP/IP models12 min
  4. Quiz: network basics5 min
Addressing4 lectures
  1. IP addresses: IPv4 and IPv612 min
  2. Subnet masks and CIDR14 min
  3. Subnetting practice10 min
  4. Quiz: addressing6 min
Core protocols4 lectures
  1. TCP, UDP and ports12 min
  2. DNS: the internet's phonebook12 min
  3. DHCP, ARP and NAT12 min
  4. Quiz: protocols5 min
Hands-on tools4 lectures
  1. ping, traceroute and ipconfig12 min
  2. Inspecting traffic with Wireshark basics12 min
  3. Project: map your home network18 min
  4. Quiz: tools5 min
Wi-Fi, web and security5 lectures
  1. How Wi-Fi works and how to secure it10 min
  2. HTTP, HTTPS and TLS12 min
  3. Firewalls, VPNs and network security basics12 min
  4. Project: troubleshoot and document a network problem18 min
  5. Quiz: Wi-Fi, web and security5 min
Careers and next steps3 lectures
  1. Cloud networking at a glance10 min
  2. Networking careers and certifications8 min
  3. Quiz: final review6 min

Who this is for

  • Students starting IT, cloud or cyber security careers
  • Freshers preparing for IT support and network engineer interviews
  • Anyone who wants to understand how the internet really works