शैडोइंग अभ्यास: Every Networking Concept Explained | Networking 101 (2026) - YouTube के साथ अंग्रेजी बोलना सीखें

Networking.

⏸ रुका हुआ

गति:

176 वाक्य

यदि वाक्य बहुत छोटे या लंबे हों, तो समायोजित करने के लिए Edit पर क्लिक करें।

Networking.

In this video I'm going to explain every major networking concept.

From the cable that connects your computer,

all the way up to VPNs, TLS and load balancers.

My name is Diego, I'm a senior DevOps engineer based in Paris

and I like breaking down tech concepts into simple and visual explanations.

If you want to see more videos like this one,

feel free to subscribe and that's all.

Back to the video.

Okay, so let's start from scratch.

We have a single computer.

If we want this device to talk to anything,

we need to at least connect a cable.

Ethernet.

It's the standard for wired connections.

Physical cables like copper or fiber optic.

Wi-Fi.

It does the same thing by sending data through the air.

Same concept, but different medium to carry the data.

Let's pick a cable for now.

So now that we have our cable,

let's connect a second device.

Even though they are already connected,

there is a problem here.

Neither of them knows who is on the other side.

MAC address.

Every network device is born with a unique hardware identifier.

It looks something like this and it's meant to be unique for each device.

When two devices are directly connected,

they use MAC addresses to recognize each other and that's pretty cool.

But what happens if you need to connect 10 devices or 100 switch?

A switch connects multiple devices on the same network.

It reads the destination MAC address on each request and sends it only to the right device.

However, there is a limitation.

MAC addresses only work locally.

You cannot use it to reach a device on a different network.

That means that we need a different type of address.

IP address.

A logical address assigned to your device,

so it can be identified across networks.

They look like this.

These ones are different.

They can change.

To get an IP address, you have two options.

One, you can assign it manually to your device.

You go into your network settings and type it yourself that's called a static IP address.

Or two, you can use DHCP, Dynamic Host Configuration Protocol.

When your device joins a network,

DHCP assigns an IP automatically, avoiding the manual setup.

Now that our device has an IP address,

it can communicate with hundreds,

even thousands of devices across different networks.

And networks can be really big, but also really small.

Subnet.

A subnet defines the size of your local network.

It tells your device how big or small the network is.

So now our device is ready to explore the outside world.

But how can it do it? router.

A router connects different networks together.

It looks at the destination IP and decides where to forward the data next.

It is the exit door of your local network,

but a network can have multiple routers connected to it,

so your device needs to know which one to use.

That's our default gateway.

It's basically our device saying,

I have no idea where this packet needs to go.

I will just send it to my default gateway and let it figure it out.

But now that the router has that packet,

how does it know where to send it?

Routes.

A route is a rule that tells the router where to forward traffic based on the destination.

You can send this manually.

That's called static routing.

You tell the router to reach this network, use this path.

For two small networks, static routing works fine.

But imagine dozens of networks inside a company.

That gets complex.

OSPF.

It is a routing protocol that allows routers inside the same organization to talk to each other,

to find the best paths automatically.

But what about the Internet?

Millions of networks run by different companies.

BGP, Border Gateway Protocol.

BGP is the routing protocol that large companies like Internet service providers use to exchange routing information with each other.

It's basically the protocol that makes the Internet.

So, static routing for small setups,

OSPF for larger internal networks in a single company,

and BGP for companies to companies.

This is basically how the internet is made.

A lot of companies talking to a lot of companies.

Now we have a full network,

devices connected locally, routers forwarding traffic,

and routing protocols making sure everything is reachable.

Let's test it.

We can send a simple ping.

Ping sends a small packet to a destination and waits for a response.

If the other side replies, you know it's alive.

Ping uses ICMP.

It is a protocol used for network troubleshooting.

100

It succeeded.

101

Our data can reach the other side.

102

But there are different ways to send data.

103

Different protocols for different needs.

104

TCP.

105

It creates a connection between two devices before sending any data.

106

It's to make sure every packet arrives without errors.

107

If a packet gets lost, TCP sends it again.

108

TCP is safe, but slow,

109

because it needs to wait for the confirmation that every packet was delivered.

110

That's why it's used for things like file transfers, UDP.

111

This one is different.

112

If a packet gets lost,

113

it's gone forever, but it's faster,

114

because we don't need to wait for confirmations.

115

That's why it's used for things like video calls, gaming, and live streaming.

116

A few packets lost won't break anything.

117

So TCP when you need reliability,

118

UDP when you need speed.

119

But I have a question.

120

Your PC can transfer files and make video calls at the same time, right?

121

How does it use both protocols at the same time?

122

The answer, ports.

123

A port is a number that tells the device which application should handle the data.

124

IP gets you to the right device.

125

The port gets you to the right application.

126

For example, port 443 for web traffic and this one for your video call.

127

So our device sends a packet to port 443 on a remote server.

128

But it's not working, like if something is blocking it.

129

Firewall.

130

A firewall controls what traffic is allowed in and out of a network.

131

It can block specific ports,

132

IP addresses, or types of traffic.

133

We need to add a firewall rule so that our packet can finally reach the server.

134

Now we are communicating.

135

Wait, who is this guy?

136

It is a hacker sitting between us and the server and he can read everything we are sending.

137

Password, messages, all of it.

138

That's because our data is being sent in plain text.

139

TLS, Transport Layer Security.

140

It encrypts the connection between two devices so no one in the middle can read or change the data.

141

You have also probably heard about SSL before.

142

TLS is basically the modern version of it.

143

Same idea, newer version.

144

So TLS protects one connection,

145

like our browser talking to that server.

146

But what if you want to protect everything?

147

Every connection from our network to this other one, VPN, Virtual Private Network network.

148

It creates an encrypted tunnel between your device or network and another one.

149

The traffic you send through the tunnel is protected,

150

so no one in the middle can see what you are sending or receiving.

151

So far, we have been using IP addresses to reach other devices.

152

But when you open your browser,

153

you don't type an IP address to visit a website.

154

You type a name, something like google.com, DNS, domain name system.

155

It translates domain names into IP addresses,

156

so you don't have memorize something like this okay

157

so now we have tcp to send the data tls to

158

encrypt the data now we are just missing the data http it's the way our browser uses to request

159

and receive web traffic like web pages for example give me this page here it is

160

and if you combine http with tls you get https now our device can finally use

161

that server this other device too this one as well

162

and this one and this other one and thousands of them

163

that server is not going to keep up load balancer a load balancer sits in front of multiple servers

164

and distributes requests across them this prevents overload and keeps the service running

165

so let's zoom out

166

and see everything we have covered we started with a single device in a cable

167

and we ended up balancing traffic across the internet That's networking.

168

Every concept builds on top of another one.

169

Every concept has its own role.

170

A good rule for learning something is to always ask yourself,

171

why do I need this?

172

And what problem does it solve?

173

If this video helped you to understand networking better,

174

give me some feedback in the comments.

175

I will appreciate it.

176

Thanks for watching and see you in the next one.

TRENDING

शैडोइंग तकनीक क्या है?

शैडोइंग (Shadowing) एक विज्ञान-समर्थित भाषा सीखने की तकनीक है जो मूल रूप से पेशेवर दुभाषिया प्रशिक्षण के लिए विकसित की गई थी। विधि सरल लेकिन शक्तिशाली है: आप मूल अंग्रेज़ी ऑडियो सुनते हैं और तुरंत इसे ज़ोर से दोहराते हैं — जैसे वक्ता की छाया 1-2 सेकंड की देरी से। शोध से पता चलता है कि यह उच्चारण सटीकता, स्वर, लय, जुड़ी हुई ध्वनियाँ, सुनने की समझ और बोलने की प्रवाहशीलता में काफ़ी सुधार करता है।

☕ हमें एक कॉफी पिलाएं

आपके समर्थन के कारण ShadowingEnglish 100% मुफ्त है। सर्वर और AI की लागत अधिक है — आपकी कॉफी हमें आगे बढ़ने में मदद करती है! 🙏

PayPal के माध्यम से दान करें

ShadowingEnglish.com – अंग्रेज़ी शैडोइंग अभ्यास

शैडोइंग अभ्यास: Every Networking Concept Explained | Networking 101 (2026) - YouTube के साथ अंग्रेजी बोलना सीखें

लोकप्रिय

इस पाठ के बारे में

मुख्य शब्दावली और वाक्यांश

व्यावहारिक टिप्स

शैडोइंग तकनीक क्या है?

शैडोइंग अभ्यास: Every Networking Concept Explained | Networking 101 (2026) - YouTube के साथ अंग्रेजी बोलना सीखें

ऐप डाउनलोड करें

इस पाठ के बारे में

मुख्य शब्दावली और वाक्यांश

व्यावहारिक टिप्स

शैडोइंग तकनीक क्या है?