跟读练习: Every Networking Concept Explained | Networking 101 (2026) - 通过YouTube学习英语口语
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Networking.
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Networking.
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In this video I'm going to explain every major networking concept.
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From the cable that connects your computer,
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all the way up to VPNs, TLS and load balancers.
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My name is Diego, I'm a senior DevOps engineer based in Paris
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and I like breaking down tech concepts into simple and visual explanations.
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If you want to see more videos like this one,
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feel free to subscribe and that's all.
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Back to the video.
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Okay, so let's start from scratch.
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We have a single computer.
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If we want this device to talk to anything,
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we need to at least connect a cable.
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Ethernet.
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It's the standard for wired connections.
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Physical cables like copper or fiber optic.
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Wi-Fi.
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It does the same thing by sending data through the air.
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Same concept, but different medium to carry the data.
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Let's pick a cable for now.
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So now that we have our cable,
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let's connect a second device.
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Even though they are already connected,
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there is a problem here.
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Neither of them knows who is on the other side.
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MAC address.
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Every network device is born with a unique hardware identifier.
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It looks something like this and it's meant to be unique for each device.
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When two devices are directly connected,
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they use MAC addresses to recognize each other and that's pretty cool.
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But what happens if you need to connect 10 devices or 100 switch?
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A switch connects multiple devices on the same network.
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It reads the destination MAC address on each request and sends it only to the right device.
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However, there is a limitation.
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MAC addresses only work locally.
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You cannot use it to reach a device on a different network.
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That means that we need a different type of address.
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IP address.
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A logical address assigned to your device,
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so it can be identified across networks.
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They look like this.
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These ones are different.
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They can change.
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To get an IP address, you have two options.
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One, you can assign it manually to your device.
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You go into your network settings and type it yourself that's called a static IP address.
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Or two, you can use DHCP, Dynamic Host Configuration Protocol.
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When your device joins a network,
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DHCP assigns an IP automatically, avoiding the manual setup.
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Now that our device has an IP address,
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it can communicate with hundreds,
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even thousands of devices across different networks.
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And networks can be really big, but also really small.
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Subnet.
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A subnet defines the size of your local network.
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It tells your device how big or small the network is.
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So now our device is ready to explore the outside world.
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But how can it do it? router.
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A router connects different networks together.
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It looks at the destination IP and decides where to forward the data next.
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It is the exit door of your local network,
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but a network can have multiple routers connected to it,
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so your device needs to know which one to use.
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That's our default gateway.
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It's basically our device saying,
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I have no idea where this packet needs to go.
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I will just send it to my default gateway and let it figure it out.
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But now that the router has that packet,
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how does it know where to send it?
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Routes.
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A route is a rule that tells the router where to forward traffic based on the destination.
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You can send this manually.
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That's called static routing.
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You tell the router to reach this network, use this path.
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For two small networks, static routing works fine.
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But imagine dozens of networks inside a company.
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That gets complex.
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OSPF.
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It is a routing protocol that allows routers inside the same organization to talk to each other,
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to find the best paths automatically.
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But what about the Internet?
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Millions of networks run by different companies.
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BGP, Border Gateway Protocol.
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BGP is the routing protocol that large companies like Internet service providers use to exchange routing information with each other.
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It's basically the protocol that makes the Internet.
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So, static routing for small setups,
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OSPF for larger internal networks in a single company,
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and BGP for companies to companies.
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This is basically how the internet is made.
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A lot of companies talking to a lot of companies.
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Now we have a full network,
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devices connected locally, routers forwarding traffic,
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and routing protocols making sure everything is reachable.
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Let's test it.
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We can send a simple ping.
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Ping sends a small packet to a destination and waits for a response.
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If the other side replies, you know it's alive.
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Ping uses ICMP.
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It is a protocol used for network troubleshooting.
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It succeeded.
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Our data can reach the other side.
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But there are different ways to send data.
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Different protocols for different needs.
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TCP.
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It creates a connection between two devices before sending any data.
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It's to make sure every packet arrives without errors.
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If a packet gets lost, TCP sends it again.
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TCP is safe, but slow,
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because it needs to wait for the confirmation that every packet was delivered.
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That's why it's used for things like file transfers, UDP.
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This one is different.
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If a packet gets lost,
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it's gone forever, but it's faster,
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because we don't need to wait for confirmations.
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That's why it's used for things like video calls, gaming, and live streaming.
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A few packets lost won't break anything.
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So TCP when you need reliability,
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UDP when you need speed.
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But I have a question.
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Your PC can transfer files and make video calls at the same time, right?
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How does it use both protocols at the same time?
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The answer, ports.
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A port is a number that tells the device which application should handle the data.
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IP gets you to the right device.
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The port gets you to the right application.
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For example, port 443 for web traffic and this one for your video call.
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So our device sends a packet to port 443 on a remote server.
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But it's not working, like if something is blocking it.
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Firewall.
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A firewall controls what traffic is allowed in and out of a network.
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It can block specific ports,
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IP addresses, or types of traffic.
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We need to add a firewall rule so that our packet can finally reach the server.
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Now we are communicating.
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Wait, who is this guy?
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It is a hacker sitting between us and the server and he can read everything we are sending.
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Password, messages, all of it.
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That's because our data is being sent in plain text.
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TLS, Transport Layer Security.
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It encrypts the connection between two devices so no one in the middle can read or change the data.
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You have also probably heard about SSL before.
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TLS is basically the modern version of it.
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Same idea, newer version.
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So TLS protects one connection,
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like our browser talking to that server.
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But what if you want to protect everything?
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Every connection from our network to this other one, VPN, Virtual Private Network network.
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It creates an encrypted tunnel between your device or network and another one.
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The traffic you send through the tunnel is protected,
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so no one in the middle can see what you are sending or receiving.
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So far, we have been using IP addresses to reach other devices.
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But when you open your browser,
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you don't type an IP address to visit a website.
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You type a name, something like google.com, DNS, domain name system.
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It translates domain names into IP addresses,
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so you don't have memorize something like this okay
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so now we have tcp to send the data tls to
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encrypt the data now we are just missing the data http it's the way our browser uses to request
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and receive web traffic like web pages for example give me this page here it is
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and if you combine http with tls you get https now our device can finally use
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that server this other device too this one as well
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and this one and this other one and thousands of them
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that server is not going to keep up load balancer a load balancer sits in front of multiple servers
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and distributes requests across them this prevents overload and keeps the service running
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so let's zoom out
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and see everything we have covered we started with a single device in a cable
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and we ended up balancing traffic across the internet That's networking.
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Every concept builds on top of another one.
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Every concept has its own role.
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A good rule for learning something is to always ask yourself,
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why do I need this?
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And what problem does it solve?
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If this video helped you to understand networking better,
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give me some feedback in the comments.
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I will appreciate it.
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Thanks for watching and see you in the next one.
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