Physical Layer EXPLAINED: Where 0s & 1s Become REAL Signals ⚡

Описание: What really travels inside an Ethernet cable or Wi-Fi signal?
Not IP. Not MAC. Not packets. Only electrical pulses, light, and radio waves.

In this video, we dive into the Physical Layer of the OSI model — the most ignored but most fundamental layer of networking.

You’ll understand:

How a binary 1 becomes voltage or light

Why cable quality affects network speed

How bits are synchronized on the wire

Difference between copper, fiber, and wireless signals

Why Physical Layer doesn’t care about IP, MAC, or frames

How data becomes real-world physics

This explanation connects:
Application → TCP → IP → Ethernet → Physical Signals

Perfect for:

Networking beginners

CCNA / CCNP students

Software engineers

Cloud & DevOps learners

Anyone who wants to truly understand how the Internet works under the hood

By the end, you’ll clearly see:

Networking is not software. It is physics.

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0:00 Problem: IP, frames, and MAC headers cannot travel directly through a wire,.
1:00 Problem: Converting raw 0s and 1s into physical signals for transmission,.
2:30 Problem: Managing electricity, light, and radio waves across different mediums,.
3:30 Problem: Determining the correct voltage levels to represent binary bits.
4:30 Problem: Maintaining bit synchronization and timing for accurate delivery,.
5:30 Problem: Overcoming attenuation and noise that drop signal frequency over distance.
7:00 Problem: Using cheap cables which lead to bit errors and dropped frames.
8:30 Problem: Differentiating hardware roles from software-based addressing like MAC,.
9:30 Problem: Understanding how Wi-Fi operates as a physical layer via radio.