Networking from Zero

Learn computer networks from scratch, without scary words. One topic per episode, and at the end you build something yourself in Cisco Packet Tracer (free from Cisco Networking Academy).

🧪 Networking lab: all the exercises online, nothing to install (Hebrew for now) →

▶6:35

Episode 0

How does a computer even talk? (0, 1 and electricity)

What really travels through the cable, why 0 and 1, bits and bytes, how the letter A becomes 01000001, and how bits travel over copper, fiber and Wi-Fi.

🧪 Practice online (Hebrew for now)

Chapters (8)

1. 00:00 Opening
2. 00:32 Part A: The problem. How do you send information without words?
3. 01:19 Part B: So why 0 and 1?
4. 02:29 Part C: From bits to letters
5. 03:39 Part D: How do the 0s and 1s actually travel?
6. 04:33 Part E: Why does this matter for networking?
7. 05:20 Summary
8. 06:02 Support the channel & end card

▶11:35

Episode 1

What is a network? Your first network in Packet Tracer

What a network is, the three kinds of players, LAN vs WAN vs the internet, and then you build your first working network in Packet Tracer, step by step, up to ping.

🧪 Practice online (Hebrew for now)📥 Packet Tracer file

Chapters (10)

1. 00:00 Opening
2. 00:32 How the series works
3. 01:05 Part A: What is a "network" anyway?
4. 01:58 Part B: The three kinds of "players" in a network
5. 04:23 Part C: Small network, big network
6. 04:54 Part D: What is Packet Tracer, and how do you get it?
7. 06:07 Part E: Building the first network, step by step
8. 09:47 Summary
9. 10:30 Outro
10. 10:59 Support the channel & end card

▶7:07

Episode 2

Talking to a switch: the command line (CLI) from zero

Cisco's black screen from zero: why a switch has an operating system, console vs Telnet vs SSH, the three rooms, hostname, password, banner, and running-config vs startup-config.

🧪 Practice online (Hebrew for now)📥 Packet Tracer file

Chapters (10)

1. 00:00 Opening
2. 00:29 Part A: Why does a switch need an "operating system"?
3. 01:27 Part B: How do you connect to a switch?
4. 02:04 Part C: Three rooms, three keys
5. 03:32 Part D: The question mark, your best friend
6. 03:59 Part E: The first settings
7. 04:49 Part F: The whiteboard and the notebook. How to save
8. 05:40 Summary
9. 06:15 Outro
10. 06:38 Support the channel & end card

▶9:27

Episode 3

An envelope inside an envelope: how the internet really works (OSI)

What a protocol is, why networking is split into layers, OSI vs TCP/IP, and how a message gets wrapped on its way. We watch the wrappings live in Packet Tracer.

🧪 Practice online (Hebrew for now)📥 Packet Tracer file

Chapters (10)

1. 00:00 Opening
2. 00:33 Part A: The rules of a conversation
3. 01:26 Part B: What does a protocol decide?
4. 02:25 Part C: Who makes the rules?
5. 02:58 Part D: Why split into layers?
6. 04:53 Part E: An envelope inside an envelope
7. 05:51 Part F: Seeing the wrappings in Packet Tracer
8. 07:57 Summary
9. 08:35 Outro
10. 08:59 Support the channel & end card

▶6:44

Episode 4

The physical layer: straight-through vs crossover cable

The road the bits travel on: bandwidth, UTP, STP and coaxial copper, the RJ45 connector, straight-through vs crossover and Auto-MDIX, fiber optics and wireless.

🧪 Practice online (Hebrew for now)📥 Packet Tracer file

Chapters (9)

1. 00:00 Opening
2. 00:27 Part A: What does the physical layer do?
3. 01:08 Part B: Copper cables
4. 02:10 Part C: Straight-through versus crossover
5. 03:32 Part D: Seeing it in Packet Tracer
6. 04:19 Part E: Fiber optics and wireless
7. 05:24 Summary
8. 05:52 Outro
9. 06:16 Support the channel & end card

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