Behailu's IT Lab
IT ኣብረን እንማማር!ኮምፒውተር ኔትወርኪንግ፥ ኔትወርክ ሴኪውሪቲ / ሳይበር ሴኪውሪቲ፥ ኤቲካል ሃኪንግ፥ ሊኑክስ፥ ወ ዘ ተ ር ፈሌሎችንም : IT ነክ ርእሶችን : ኣብረን እንማማር
Computer networking, made clear

See how the network works.

Beginner-friendly lessons that turn switches, packets, IP addresses, and protocols into ideas you can picture—and skills you can use.

Networks around us

Explore Networking in the Real World

Discover how devices connect locally, communicate across the world, and access services in data centers.

Diagram of devices connected in a local area network

Local Area Network (LAN)

Connects devices within a limited area, such as a home, office, or school.

Diagram showing networks connected across a wide area network

Wide Area Network (WAN)

Connects networks across cities, countries, and continents.

Inside a modern data center with server racks and network infrastructure

Inside a Data Center

Explore the servers, switches, storage, and infrastructure that support digital services.

Explore & quiz

Practice more networking topics.

Pick a topic, explore four key ideas, then check what you learned.

LAN vs WAN

Compare local networks with networks spanning larger distances.

Explore & quiz

Network devices

Learn the roles of switches, routers, access points, and servers.

Explore & quiz

Ethernet frames

See how MAC addresses and frames move data across a link.

Explore & quiz

TCP three-way handshake

Follow SYN, SYN-ACK, and ACK to establish a connection.

Explore & quiz

IP addresses & NAT

Understand IPv4 addresses, prefixes, private networks, and NAT.

Explore & quiz

Subnetting

Learn prefixes, host ranges, and how borrowed bits create subnets.

Explore & quiz

Practice DNS step by step.

Follow the resolver journey, experiment with caching and record types, and test yourself with an interactive quiz.

Open DNS Resolver Lab

See subnetting one bit at a time.

Calculate network ranges, move the CIDR boundary, and watch borrowed bits create new IPv4 subnets.

Open Subnetting Simulator

Explore the seven OSI layers.

See what each layer does, test your knowledge, and arrange all seven in order.

Open OSI Model Lab

Ports, protocols & OSI layers.

Look up common port numbers and understand where each protocol fits.

Open cheat sheet
Featured lessons

Build the picture,
one concept at a time.

Each lesson starts with a familiar analogy, adds a clean visual, and finishes with the technical idea you need to remember.

01 / FOUNDATIONS

How devices communicate

Start with networks, LANs and WANs, switches, routers, and the journey a message takes.

Start here
02 / ADDRESSING

IP addresses & subnetting

Understand IPv4, subnet masks, address classes, NAT, and why networks are divided.

Build confidence
03 / SERVICES

DHCP, DNS & TCP

Follow DORA, translate names with DNS, and watch a TCP three-way handshake happen.

Connect the pieces
Latest on YouTube

Watch the newest
lessons.

Learn computer networking in Amharic through clear explanations, practical examples, and visual demonstrations.

Visit the channel

DHCP Server — ዲ: ኤች: ሲ: ፒ

Latest lesson · 15 minutes

Subnetting — Part 2

Step-by-step lesson · 18 minutes

Subnetting — መግቢያ

Introduction · 31 minutes

Suggested path

Learn in the right order.

No random jumping. Move from the physical network to addressing, then protocols and services.

01Network foundationsDevices, LAN vs WAN, switches and routers
02How data travelsOSI model, Ethernet frames, MAC addresses
03Addressing the networkIPv4, subnet masks, subnetting and NAT
04Core network servicesDHCP, DNS, TCP and troubleshooting
“Networking becomes easier when you can see what each device and protocol is actually doing.”
About the lab

Practical lessons from a network engineer.

Behailu's IT Lab is a learning space for people beginning their IT journey. The goal is simple: explain technical ideas in Amharic, use real network examples, and help learners build strong fundamentals.

NetworkingLinux basicsPython basicsNetwork automationCybersecurity basics