Prática de Shadowing: Network Devices - Hosts, IP Addresses, Networks - Networking Fundamentals - Lesson 1a - Aprenda a falar inglês com vídeo
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Hello, welcome to the first lesson in the first module of my new course on networking fundamentals.
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In this module, we'll be exploring how data flows through the Internet.
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Crucial to that is understanding the various devices which are involved to make that possible.
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In this lesson, we'll be exploring these various devices and the related concepts.
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We'll be doing this in two parts.
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In this video, we'll unpack hosts, IP addresses, and networks, And in the next video, we'll explore these devices.
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And let's just jump right into it by defining our first term.
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Host.
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Hosts are any device which sends or receive traffic.
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For example, your computer is a host, your laptop, your phone, your printer, your servers, those are all considered hosts.
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But we're also in the cloud days, which means there's many cloud resources that can also be considered as host.
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Cloud servers for example.
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Moreover, we're also in the Internet of Things days, which means anything you have at your house that sends
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or receive traffic is also considered a host that smart TV you stream to, those speakers that are all synchronized with each other, smart watches, your thermometer that you can control remotely,
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that refrigerator that reminds you when you're out of milk, All those devices are sending and receiving traffic and therefore can be considered as hosts.
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Why this is important is because all these devices follow the same rules for how they communicate to the Internet.
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Later in this module, we'll be looking at everything a host does when sending or receiving data from the Internet.
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In doing so, we'll actually be explaining how all these devices communicate with the Internet.
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Hosts typically fall in one of two categories: clients or servers.
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Clients are the hosts that are initiating the request and servers are the hosts that are responding to requests.
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For example, let's just say this is the web server for the website www .Site .com.
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Well, when this computer over here is making a request to ask for the website site .com, it's initiating a request and therefore it is considered the client.
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When the web server site .com is providing the content for site .com, it's responding to the request therefore it is considered the server.
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Keep in mind, however, the terms client and server are relative to a specific communication.
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Meaning.
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At some point, this web server is going to have to update its files from a file server or a database server.
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Well, for that, the web server has to make a request to the file server to ask for new files.
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In that communication, the web server is the client and the file server is the server.
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we can take it a step further.
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This file server at some point might need to run some sort of software update.
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Well, when it's making the request to the update server to download the new software, it's acting as the client.
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And when the update server is providing the updates back to the file server, it's acting as the server.
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So the terms client -server are specific to the communication that is occurring.
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Now we've been calling this a web server, but I want to clearly define what that is.
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A server is nothing more than a computer with software installed which knows how to respond to specific requests.
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This guy right here is really just a computer that has software installed that knows how to serve web pages.
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You can turn any device into a web server by simply installing the proper web server software.
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It's the same way with the file server and the update server we discussed a second ago.
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In the end, they are merely computers with software that knows how to provide files or provide updates.
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Each server you encounter is simply a computer responding to requests.
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That wraps up our discussion on hosts.
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Next, we want to define IP addresses.
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IP addresses are the identity of each host, and every single host must have an IP address if it means to communicate on the Internet.
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Just like you need a phone number in order to send or receive phone calls, or you need a mailing address in order to send and receive mail,
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You need an IP address in order to send or receive packets on a network.
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This is what the IP address is.
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It is the identity of every single host.
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Now, these IP addresses are actually going to be stamped on everything that each host sends.
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For example, when this client over here makes a web request to site .com, On this packet, which includes what web page it is asking for,
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the client is going to stamp the source and destination IP addresses.
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The source IP address is going to be the client's IP address
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and the destination IP address is going to be the server's IP address.
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In the same way, when the server responds by providing the web page, it's also going to stamp the source and destination IP addresses for that communication.
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Here, the source IP address will be the server, and then the destination IP address will be the client.
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Everything sent on the Internet is going to have this source and destination IP address.
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Now, an IP address itself is really just 32 bits.
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A bit is a 1 or a 0
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which means every single IP address is really just a different combination of 32 ones and zeros.
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What we do is we take those 32 bits and break them up into four chunks, which we call octets.
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and we convert each of those octets into a decimal number.
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This is how we get to what we know of as an IP address.
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The smallest binary number you can get with 8 bits is 0, and the largest binary number you can get with 8 bits is 255.
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That's why every IP address you come across is going to be 4 .0 instances of the numbers 0 through 255.
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Now in this module we're not going to be exploring binary.
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We've already created some videos that discuss binary.
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If you're interested in learning about binary and how this conversion happens, please check out those videos.
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There'll be a link in the description.
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Either way, that is what an IP address is.
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Thank you.
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Now these IP addresses are typically assigned in some sort of hierarchy, so let me explain that.
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Imagine this is the Acme Corporation and the Acme Corporation owns every IP address that starts with 10 .anything.
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Well, maybe the Acme Corporation has three different offices one in New York, one in London, and one in Tokyo.
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and each of those officers is going to have a subset of the ACME Corporation IP space.
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New York might have everything that starts with 10 .20.
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London might have everything that starts with 10, not 30.
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and Tokyo might have everything that starts with 10 .40.
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Moreover, the New York office might have a few different teams.
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For instance, they might have a sales team, an engineering team, and a marketing team.
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and each of those teams would have their own dedicated IP address space.
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Sales team could have everything that starts with 10, 20, 55.
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The engineering team would have everything that starts with 1020 .66, and marketing would have 1020 .77.
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The London and Tokyo offices probably have those same teams as well.
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But each of their IP address space is going to start with the prefix for that particular location.
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This allows the IP address to sort of pinpoint where a particular host exists.
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For example, if we had the IP address 10 .30 .55 .127,
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That ipodorus is the identity of a host that sits in the ACME corporation in the London office, on the sales team.
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Now this breaking up of IP addresses into their different hierarchies is done through a process known as subnetting.
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In this module we're not going to be covering subdenning, but we've already created some videos discussing how subdenning works, If you're interested in learning sub -deading, please check out those videos.
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There will be a link in the description.
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For us, we're going to continue with our exploration of network devices.
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All of the hosts
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that sit inside each of these teams at each of these offices exist in what is known as a network.
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A network is what actually does the transportation of traffic between hosts.
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In its simplest form, anytime you connect two hosts, you have a network.
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If you plug these hosts directly into each other, you have a network.
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Before networks, in order to move data from this computer to this computer, you would literally have to walk up to this computer Plug in a disk.
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Download some files, then walk over to the other computer, plug in that same disk, and upload those files.
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Networking and networks are what automated that process.
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They allowed these computers to share data with each other automatically.
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Now if you take a step back, a network is really just a logical grouping of hosts which require similar connectivity.
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So let me explain that.
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At your house, you probably have some sort of home Wi -Fi network.
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on that network you've got your computer your printer laptops phones a bunch of different devices which all have similar connectivity profiles,
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meaning they just use the internet or check email or something along those lines.
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Well, down the street from you there might be a coffee shop that provides Wi -Fi for its tenants.
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and that coffee shop is going to have various customers that have various mobile devices that are all connecting to the Internet.
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Well these devices all have similar connectivity profiles, they just need access to the Internet.
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But since they're coming from a different location as these devices, they are grouped into two separate networks.
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Now networks can also contain other networks.
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For example, you probably have a school not too far from where you live.
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and that school has its own network.
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Thank you.
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But within that school are a bunch of classrooms, and it's very possible that inside each of those classrooms
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All the hosts in each classroom are grouped up into their own network.
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Now these networks within other networks are sometimes referred to as subnetworks or subnets.
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and this is a very common occurrence on the Internet.
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In fact, that illustration we just did with the ACME Corporation with the three offices
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and the three different teams in each of these offices
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while the office location is a subnet of the Acme Corporation IP space.
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and the specific teams are a subnet of the New York IP space.
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So you can have networks within networks within networks.
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Either way, all these networks then connect to each other.
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For example, you might be sitting at your house
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and might want to do some sort of working from home and be able to access the office networks.
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Or possibly you're studying from a coffee shop and you might want to access school resources.
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Well, instead of having each of these networks connect directly to each other in every possible combination, Instead, all those networks are connected to a central resource.
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namely the internet.
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In fact, what we know of as the Internet is simply a bunch of interconnected networks.
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That's all the Internet is.
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It's just a bunch of company networks connected to a bunch of school networks connected to a bunch of customer networks.
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Of course, what handles those connections are often the Internet Service Providers or the ISPs, but that goes a little bit deeper than we want to get at this point.
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Either way, that wraps up our discussion on hosts, IP addresses, and networks.
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In part two, we'll continue our discussion by unpacking repeaters, hubs, bridges, switches, and routers.
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The key takeaway from this lesson is understanding what hosts are, understanding the designations client and server, understanding what IP addresses are and their hierarchical nature,
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and understanding what a network is, specifically that it is a logical grouping of related hosts which require similar connectivity.
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I hope you enjoyed this lesson.
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I want to thank you for watching and we'll see you in the next one.
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Hey YouTube, I hope you enjoyed that free lesson from my new course on networking fundamentals.
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I'll be releasing the entire first module for free on YouTube.
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I want this course to be the ultimate networking fundamentals course.
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And since I'm still scoping out the outline for the rest of the course, you can have a say in what topics will be covered.
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Let me know in the comments below what subjects you want included in this course.
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Otherwise, remember to like and subscribe and click the notification bell so you know when the next lesson releases.
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And of course, if you enjoyed this lesson, the best way to say thanks is to share this video with your friends.
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I hope you enjoyed this lesson, and I want to thank you for watching.
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Vocabulário e dicas de fala para esta lição
Esta aula de conversação de nível C1 usa o vídeo “Network Devices - Hosts, IP Addresses, Networks - Networking Fundamentals - Lesson 1a”. As palavras que mais se repetem: server, network, host, address, internet. Este vídeo tem 145 frases e 2156 palavras para praticar shadowing. A fala dura 11:29. O falante fala rápido, cerca de 188 palavras por minuto, então espere sons ligados e reduzidos. Apenas 81% das palavras estão entre as 3.000 mais comuns do inglês, por isso o vocabulário é exigente.
Vocabulário principal deste vídeo
As 15 palavras mais avançadas do vídeo, com pronúncia e significado:
| Palavra | Pronúncia | Significado |
|---|---|---|
| module substantivo | /ˈmɑd͡ʒul/ | módulo |
| binary adjetivo | /ˈbaɪ.nə.ɹi/ | binário |
| subnet substantivo | sub-rede | |
| connectivity substantivo | conectividade | |
| octet substantivo | /ɒkˈtɛt/ | octeto |
| unpack verbo | /ʌnˈpæk/ | desempacotar |
| packet substantivo | /ˈpæk.ɪt/ | pacote |
| hierarchy substantivo | /ˈhaɪ.ə.ɹɑː(ɹ).ki/ | hierarquia |
| printer substantivo | /ˈpɹɪntɚ/ | impressor |
| disk substantivo | /dɪsk/ | disco |
| automate verbo | /ˈɔ.təˌmeɪt/ | automatizar |
| decimal substantivo | /ˈdɛs.ɪ.məl/ | decimal |
| hierarchical adjetivo | /ˌhaɪəˈɹɑːkɪkəl/ | hierárquico |
| interconnect verbo | /ˌɪn.tə.kəˈnɛkt/ | interligar |
| repeater substantivo | /ɹɪˈpiːtə(ɹ)/ | repetidor, repetidora |
Phrasal verbs que você vai ouvir
| Palavra | Significado |
|---|---|
| check out verbo | verificar, sacar só |
| wrap up verbo | embrulhar, empacotar |
Gramática neste vídeo
As estruturas que o falante mais usa, com as palavras exatas do vídeo:
| Estrutura | No vídeo |
|---|---|
| Voz passiva be + particípio passado — o foco está no que acontece, não em quem faz | are involved · be considered · is also considered |
| Orações relativas who / which + oração — informação extra sobre uma pessoa ou coisa | devices which are · days, which means |
| Present perfect have/has + particípio passado — uma ação passada que ainda importa agora | We've already created |
Pronúncia para ficar de olho
O falante usa 26 contrações e formas reduzidas, como we'll, we're, you're. Diga-as na forma curta, do jeito que você ouve.
- Os sons de “sh” e “zh”: initiate /ɪˈnɪʃ.i.eɪt/, designation /dɛzɪɡˈneɪʃən/, notification /ˌnoʊtɪfɪˈkeɪʃn̩/, illustration /ˌɪləsˈtɹeɪ̯ʃən/
- Palavras longas — acerte a sílaba tônica: initiate /ɪˈnɪʃ.i.eɪt/, hierarchy /ˈhaɪ.ə.ɹɑː(ɹ).ki/, hierarchical /ˌhaɪəˈɹɑːkɪkəl/, interconnect /ˌɪn.tə.kəˈnɛkt/, thermometer /θɚˈmɑ.mɪ.tɚ/
Sons difíceis para falantes de português:
- Consoante final — sem acrescentar um “i” depois: octet /ɒkˈtɛt/, unpack /ʌnˈpæk/, initiate /ɪˈnɪʃ.i.eɪt/, packet /ˈpæk.ɪt/, disk /dɪsk/
- /l/ final — a língua toca o céu da boca, não vira “u”: module /ˈmɑd͡ʒul/, decimal /ˈdɛs.ɪ.məl/, hierarchical /ˌhaɪəˈɹɑːkɪkəl/
- /h/ — um sopro suave, diferente do “r”: hierarchy /ˈhaɪ.ə.ɹɑː(ɹ).ki/, hierarchical /ˌhaɪəˈɹɑːkɪkəl/, hub /hʌb/
Como praticar com este vídeo
- Ouça o vídeo inteiro uma vez sem falar e anote as palavras que você não conhece.
- Comece na velocidade 0,75×, faça shadowing frase por frase e volte à velocidade normal quando ficar fácil.
- Grave a sua voz e compare com o original, prestando atenção a palavras como module, binary, subnet.
O que é a Técnica de Shadowing?
Shadowing é uma técnica de aprendizado de idiomas com base científica, originalmente desenvolvida para o treinamento de intérpretes profissionais. O método é simples, mas poderoso: você ouve áudio em inglês nativo e repete imediatamente em voz alta — como uma sombra seguindo o falante com 1-2 segundos de atraso. Pesquisas mostram melhora significativa na precisão da pronúncia, entonação, ritmo, sons conectados, compreensão auditiva e fluência na fala.