Every time you open Facebook, join a Google Meet class, check your result online or send money through a mobile wallet, a network is doing the work. Networking is the part of IT that connects everything else. Programmers, database administrators and cybersecurity engineers all depend on it.
If you are studying BSc CSIT, BITM, BCA or any IT course in Nepal, networking is a core subject. It is also one of the most employable skill areas, because banks, telecom companies, ISPs, hospitals and government offices all run networks and need people who understand them.
This guide explains the basics in plain language and ends with a hands-on lab you can do on your own laptop today.
What is a computer network?
A computer network is two or more devices connected so they can share data and resources. The devices can be laptops, phones, printers, servers or ATMs. The connection can be a cable (Ethernet, fibre) or wireless (Wi-Fi, mobile data).
A simple example is your home. Your phone, laptop and smart TV connect to one Wi-Fi router, and that router connects to your ISP and then to the internet.
Types of networks
| Type | Full form | Coverage | Example |
|---|---|---|---|
| PAN | Personal Area Network | A few metres | Phone connected to Bluetooth earbuds |
| LAN | Local Area Network | A room, home or building | College computer lab |
| MAN | Metropolitan Area Network | A city | An ISP network across Kathmandu Valley |
| WAN | Wide Area Network | Countries or continents | A bank connecting its branches across Nepal; the internet itself |
Exam tip: Questions often ask you to differentiate LAN and WAN. Compare them on coverage area, speed, cost, ownership and technology.
The 8 concepts every student must know
1. Client and server
A client requests a service (your browser). A server provides it (the machine hosting a website). Most of the internet works this way.
2. IP address
An IP address identifies a device on a network, like a house number on a street. IPv4 looks like 192.168.1.10. IPv6 is longer and was created because IPv4 addresses are running out.
3. MAC address
A MAC address is the permanent hardware address of a network card. An IP address can change when you move to a different network, but the MAC address stays with the device.
4. Router, switch and hub
- Hub: sends incoming data to every port. It is simple, noisy and now mostly obsolete.
- Switch: sends data only to the intended device inside a LAN.
- Router: connects different networks and decides the best path between them. Your home router connects your LAN to the internet.
5. DNS (Domain Name System)
People remember names like macha.com.np. Computers need numbers. DNS translates the name into an IP address, so it works like the internet’s phone book.
6. DHCP
DHCP automatically gives devices an IP address when they join a network. Without it, you would have to configure every phone and laptop by hand.
7. Protocols
A protocol is a set of rules for communication. Common ones are HTTP/HTTPS (web), FTP (file transfer), SMTP/IMAP (email), TCP and UDP (transport) and IP (addressing and routing).
8. The OSI and TCP/IP models
These models break communication into layers so each layer does one job.
| # | OSI layer | What it does | Example |
|---|---|---|---|
| 7 | Application | Services used by apps | HTTP, DNS, SMTP |
| 6 | Presentation | Format, encryption, compression | TLS, JPEG |
| 5 | Session | Opens and closes sessions | Login sessions |
| 4 | Transport | Reliable or fast delivery | TCP, UDP |
| 3 | Network | Addressing and routing | IP, routers |
| 2 | Data Link | Delivery inside a LAN | MAC, switches |
| 1 | Physical | Bits on the wire or air | Cables, Wi-Fi signals |
Memory trick (top to bottom): All People Seem To Need Data Processing.
What happens when you open a website?
When you type www.macha.com.np in your browser:
- Your device asks a DNS server for the site’s IP address.
- Your browser opens a TCP connection to that IP address.
- With HTTPS, a TLS handshake sets up encryption.
- Your browser sends an HTTP request.
- The server replies with the page, and your browser displays it.
All of this usually takes less than a second, and it uses almost every concept above.
Hands-on lab: try it on your own laptop (15 minutes)
You do not need any special equipment. Open Command Prompt (Windows) or Terminal (Linux/macOS).
Task 1: Find your IP configuration
- Windows:
ipconfig - Linux/macOS:
ip aorifconfig
Write down your IP address, subnet mask and default gateway.
Task 2: Test connectivity
ping 8.8.8.8
ping www.macha.com.npIf the first works and the second fails, what does that tell you? (Hint: think about DNS.)
Task 3: Trace the route
- Windows:
tracert www.macha.com.np - Linux/macOS:
traceroute www.macha.com.np
Count how many hops your data takes. Each hop is a router.
Task 4: Look up DNS
nslookup www.macha.com.npWrite a short report with what you ran, what you saw and what each result means. It makes a good portfolio piece or lab report.
Practice questions
- Differentiate between a switch and a router.
- What is the role of DNS? What happens if the DNS server is down?
- Name the layer of the OSI model at which each of these works: router, switch, HTTP, TCP.
- Why was IPv6 introduced?
- Explain the difference between TCP and UDP with one example of each.
Suggested answers: write your own first, then compare with your class notes or textbook.
Why networking is worth your time
Networking knowledge opens several career paths: network engineer, system administrator, cybersecurity analyst, cloud engineer and IT support specialist. Entry-level certifications such as Cisco CCNA and CompTIA Network+ are widely recognised, and many students start preparing for them in their second or third year.
A good plan:
- Master the basics in this article.
- Practice with a free simulator such as Cisco Packet Tracer.
- Build a small home or college lab.
- Move on to routing, switching and network security.
Continue learning on Learn & Explore
- What Is Information Technology?
- Components of an Information Technology System
- IT Career Guide for College Students in Nepal
- BSc CSIT at Tribhuvan University: Complete Student Guide
- BITM at Tribhuvan University
Your turn: Which lab command surprised you most? Tell us in the comments, and let us know which networking topic (subnetting, OSI in depth, Wi-Fi security) you want next.