쉐도잉 연습: Network Devices - Hosts, IP Addresses, Networks - Networking Fundamentals - Lesson 1a - 영상으로 영어 말하기 배우기

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Hello, welcome to the first lesson in the first module of my new course on networking fundamentals.

In this module, we'll be exploring how data flows through the Internet.

Crucial to that is understanding the various devices which are involved to make that possible.

In this lesson, we'll be exploring these various devices and the related concepts.

We'll be doing this in two parts.

In this video, we'll unpack hosts, IP addresses, and networks, And in the next video, we'll explore these devices.

And let's just jump right into it by defining our first term.

Host.

Hosts are any device which sends or receive traffic.

For example, your computer is a host, your laptop, your phone, your printer, your servers, those are all considered hosts.

But we're also in the cloud days, which means there's many cloud resources that can also be considered as host.

Cloud servers for example.

Moreover, we're also in the Internet of Things days, which means anything you have at your house that sends

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,

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.

Why this is important is because all these devices follow the same rules for how they communicate to the Internet.

Later in this module, we'll be looking at everything a host does when sending or receiving data from the Internet.

In doing so, we'll actually be explaining how all these devices communicate with the Internet.

Hosts typically fall in one of two categories: clients or servers.

Clients are the hosts that are initiating the request and servers are the hosts that are responding to requests.

For example, let's just say this is the web server for the website www .Site .com.

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.

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.

Keep in mind, however, the terms client and server are relative to a specific communication.

Meaning.

At some point, this web server is going to have to update its files from a file server or a database server.

Well, for that, the web server has to make a request to the file server to ask for new files.

In that communication, the web server is the client and the file server is the server.

we can take it a step further.

This file server at some point might need to run some sort of software update.

Well, when it's making the request to the update server to download the new software, it's acting as the client.

And when the update server is providing the updates back to the file server, it's acting as the server.

So the terms client -server are specific to the communication that is occurring.

Now we've been calling this a web server, but I want to clearly define what that is.

A server is nothing more than a computer with software installed which knows how to respond to specific requests.

This guy right here is really just a computer that has software installed that knows how to serve web pages.

You can turn any device into a web server by simply installing the proper web server software.

It's the same way with the file server and the update server we discussed a second ago.

In the end, they are merely computers with software that knows how to provide files or provide updates.

Each server you encounter is simply a computer responding to requests.

That wraps up our discussion on hosts.

Next, we want to define IP addresses.

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.

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,

You need an IP address in order to send or receive packets on a network.

This is what the IP address is.

It is the identity of every single host.

Now, these IP addresses are actually going to be stamped on everything that each host sends.

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,

the client is going to stamp the source and destination IP addresses.

The source IP address is going to be the client's IP address

and the destination IP address is going to be the server's IP address.

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.

Here, the source IP address will be the server, and then the destination IP address will be the client.

Everything sent on the Internet is going to have this source and destination IP address.

Now, an IP address itself is really just 32 bits.

A bit is a 1 or a 0

which means every single IP address is really just a different combination of 32 ones and zeros.

What we do is we take those 32 bits and break them up into four chunks, which we call octets.

and we convert each of those octets into a decimal number.

This is how we get to what we know of as an IP address.

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.

That's why every IP address you come across is going to be 4 .0 instances of the numbers 0 through 255.

Now in this module we're not going to be exploring binary.

We've already created some videos that discuss binary.

If you're interested in learning about binary and how this conversion happens, please check out those videos.

There'll be a link in the description.

Either way, that is what an IP address is.

Thank you.

Now these IP addresses are typically assigned in some sort of hierarchy, so let me explain that.

Imagine this is the Acme Corporation and the Acme Corporation owns every IP address that starts with 10 .anything.

Well, maybe the Acme Corporation has three different offices one in New York, one in London, and one in Tokyo.

and each of those officers is going to have a subset of the ACME Corporation IP space.

New York might have everything that starts with 10 .20.

London might have everything that starts with 10, not 30.

and Tokyo might have everything that starts with 10 .40.

Moreover, the New York office might have a few different teams.

For instance, they might have a sales team, an engineering team, and a marketing team.

and each of those teams would have their own dedicated IP address space.

Sales team could have everything that starts with 10, 20, 55.

The engineering team would have everything that starts with 1020 .66, and marketing would have 1020 .77.

The London and Tokyo offices probably have those same teams as well.

But each of their IP address space is going to start with the prefix for that particular location.

This allows the IP address to sort of pinpoint where a particular host exists.

For example, if we had the IP address 10 .30 .55 .127,

That ipodorus is the identity of a host that sits in the ACME corporation in the London office, on the sales team.

Now this breaking up of IP addresses into their different hierarchies is done through a process known as subnetting.

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.

There will be a link in the description.

For us, we're going to continue with our exploration of network devices.

All of the hosts

that sit inside each of these teams at each of these offices exist in what is known as a network.

A network is what actually does the transportation of traffic between hosts.

In its simplest form, anytime you connect two hosts, you have a network.

If you plug these hosts directly into each other, you have a network.

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.

Download some files, then walk over to the other computer, plug in that same disk, and upload those files.

Networking and networks are what automated that process.

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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이 레슨의 어휘와 말하기 포인트

이 C1 수준 말하기 레슨은 영상 “Network Devices - Hosts, IP Addresses, Networks - Networking Fundamentals - Lesson 1a”을(를) 바탕으로 합니다. 가장 자주 반복되는 단어는 다음과 같습니다: server, network, host, address, internet. 이 영상에는 섀도잉할 문장 145개와 단어 2156개가 있습니다. 말하는 구간의 길이는 11:29입니다. 화자는 분당 약 188단어로 빠르게 말하므로 연음과 약하게 발음되는 소리가 많습니다. 영어에서 가장 많이 쓰이는 3,000단어에 속하는 단어가 81%뿐이라 어휘가 어려운 편입니다.

이 영상의 핵심 어휘

영상에서 가장 어려운 단어 15개를 발음, 뜻과 함께 정리했습니다.

단어	발음	뜻
module 명사	/ˈmɑd͡ʒul/	모듈
binary 형용사	/ˈbaɪ.nə.ɹi/	참거짓, 진리
packet 명사	/ˈpæk.ɪt/	패킷, 소포
hierarchy 명사	/ˈhaɪ.ə.ɹɑː(ɹ).ki/	계층
printer 명사	/ˈpɹɪntɚ/	인쇄자
disk 명사	/dɪsk/	디스크, 원반
automate 동사	/ˈɔ.təˌmeɪt/	자동화하다
decimal 명사	/ˈdɛs.ɪ.məl/	십진법
prefix 명사	/ˈpɹiːfɪks/	접두사, 접두어
router 명사	/ˈɹaʊ.tɚ/	라우터
thermometer 명사	/θɚˈmɑ.mɪ.tɚ/	온도계, 체온계
subset 명사	/ˈsʌbˌsɛt/	부분집합
refrigerator 명사	/ɹɪˈfɹɪd͡ʒ.əˌɹeɪ.tɚ/	냉장고, 랭장고
chunk 명사	/t͡ʃʌŋk/	조각
occurrence 명사	/əˈkɜɹ.əns/	사건

영상에 나오는 구동사

단어	뜻
wrap up 동사	시마이치다

이 영상의 문법

화자가 가장 많이 쓰는 문형을 영상 속 실제 표현과 함께 정리했습니다.

문형	영상 속 표현
수동태 be + 과거분사 — 누가 하는지보다 무슨 일이 일어나는지에 초점	are involved · be considered · is also considered
관계절 who / which + 절 — 사람이나 사물에 대한 추가 정보	devices which are · days, which means
현재완료 have/has + 과거분사 — 과거의 일이 지금도 관련이 있을 때	We've already created

주의할 발음

화자는 we'll, we're, you're 같은 축약형과 약화된 형태를 26번 사용합니다. 들리는 대로 짧게 발음하세요.

“sh”와 “zh” 소리: initiate /ɪˈnɪʃ.i.eɪt/, designation /dɛzɪɡˈneɪʃən/, notification /ˌnoʊtɪfɪˈkeɪʃn̩/, illustration /ˌɪləsˈtɹeɪ̯ʃən/
긴 단어 — 강세 위치에 주의: initiate /ɪˈnɪʃ.i.eɪt/, hierarchy /ˈhaɪ.ə.ɹɑː(ɹ).ki/, hierarchical /ˌhaɪəˈɹɑːkɪkəl/, interconnect /ˌɪn.tə.kəˈnɛkt/, thermometer /θɚˈmɑ.mɪ.tɚ/

한국어 화자가 어려워하는 소리:

/f/ — ㅍ(/p/)으로 바꾸지 말고 윗니를 아랫입술에 대기: prefix /ˈpɹiːfɪks/, refrigerator /ɹɪˈfɹɪd͡ʒ.əˌɹeɪ.tɚ/, notification /ˌnoʊtɪfɪˈkeɪʃn̩/
/z/ — ㅈ이 아니라 성대를 울리는 /s/: synchronize /ˈsɪŋ.kɹə.naɪːz/, designation /dɛzɪɡˈneɪʃən/
/r/과 /l/ 구별하기: hierarchical /ˌhaɪəˈɹɑːkɪkəl/, remotely /ɹɪˈmoʊtli/, illustration /ˌɪləsˈtɹeɪ̯ʃən/

이 영상으로 연습하는 방법

먼저 말하지 않고 영상을 끝까지 듣고 모르는 단어를 적어 둡니다.
0.75배속으로 한 문장씩 섀도잉을 시작하고, 익숙해지면 보통 속도로 돌아갑니다.
자신의 목소리를 녹음해 원본과 비교하고, module, binary, packet 같은 단어에 특히 주의합니다.

쉐도잉이란? 영어 실력을 빠르게 키우는 과학적 방법

쉐도잉(Shadowing)은 원래 전문 통역사 훈련을 위해 개발된 언어 학습 기법으로, 다언어 학자인 Dr. Alexander Arguelles에 의해 대중화된 방법입니다. 핵심 원리는 간단하지만 매우 강력합니다: 원어민의 영어를 들으면서 1~2초의 짧은 지연으로 즉시 소리 내어 따라 말하는 것——마치 '그림자(shadow)'처럼 화자를 따라가는 것입니다. 문법 공부나 수동적인 청취와 달리, 쉐도잉은 뇌와 입 근육이 동시에 실시간으로 영어를 처리하고 재현하도록 훈련합니다. 연구에 따르면 이 방법은 발음 정확도, 억양, 리듬, 연음, 청취력, 말하기 유창성을 크게 향상시킵니다. IELTS 스피킹 준비와 자연스러운 영어 소통을 원하는 분들에게 특히 효과적입니다.

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쉐도잉 연습: Network Devices - Hosts, IP Addresses, Networks - Networking Fundamentals - Lesson 1a - 영상으로 영어 말하기 배우기

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