シャドーイング練習: Network Devices - Hosts, IP Addresses, Networks - Networking Fundamentals - Lesson 1a - 動画で英語スピーキングを学ぶ

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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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このレッスンの語彙とスピーキングのポイント

このC1レベルのスピーキングレッスンは、動画「Network Devices - Hosts, IP Addresses, Networks - Networking Fundamentals - Lesson 1a」を教材にしています。繰り返し出てくる語は次のとおりです：server, network, host, address, internet。この動画には、シャドーイング用の文が145文、単語が2156語あります。音声の長さは11:29です。話す速さは速く、1分あたり約188語です。音のつながりや弱く発音される音が多くなります。英語の頻出3,000語に含まれる単語は81%だけなので、語彙は難しめです。

この動画の重要語彙

動画の中で特に難しい単語15語を、発音と意味つきで紹介します。

単語	発音	意味
module 名詞	/ˈmɑd͡ʒul/	モジュール
connectivity 名詞		接続性
unpack 動詞	/ʌnˈpæk/	解く
initiate 動詞	/ɪˈnɪʃ.i.eɪt/	始める, 取り掛かる
packet 名詞	/ˈpæk.ɪt/	パケット, 小包
hierarchy 名詞	/ˈhaɪ.ə.ɹɑː(ɹ).ki/	階層, 序列
printer 名詞	/ˈpɹɪntɚ/	印刷者
disk 名詞	/dɪsk/	ディスク, 円盤
automate 動詞	/ˈɔ.təˌmeɪt/	自動化する
decimal 名詞	/ˈdɛs.ɪ.məl/	十進数, 十進法
interconnect 動詞	/ˌɪn.tə.kəˈnɛkt/	相互接続
prefix 名詞	/ˈpɹiːfɪks/	接頭辞, 接頭語
router 名詞	/ˈɹaʊ.tɚ/	ルータ, ルーター
synchronize 動詞	/ˈsɪŋ.kɹə.naɪːz/	同調する, 同期する
thermometer 名詞	/θɚˈmɑ.mɪ.tɚ/	温度計, 体温計

動画に出てくる句動詞

単語	意味
check out 動詞	試験する, 検査する

この動画の文法

話し手がよく使っている文型を、動画の実際の表現とともに紹介します。

文型	動画での表現
受動態 be + 過去分詞 — 誰がするかより、何が起きるかに焦点を当てる	are involved · be considered · is also considered
関係詞節 who / which + 節 — 人や物について情報を加える	devices which are · days, which means
現在完了形 have/has + 過去分詞 — 過去の出来事が今も関係している	We've already created

注意したい発音

話し手はwe'll, we're, you'reなど、短縮形や弱形を26回使っています。聞こえたとおりの短い形で発音しましょう。

「sh」と「zh」の音: initiate /ɪˈnɪʃ.i.eɪt/, designation /dɛzɪɡˈneɪʃən/, notification /ˌnoʊtɪfɪˈkeɪʃn̩/, illustration /ˌɪləsˈtɹeɪ̯ʃən/
長い単語（アクセントの位置に注意）: initiate /ɪˈnɪʃ.i.eɪt/, hierarchy /ˈhaɪ.ə.ɹɑː(ɹ).ki/, hierarchical /ˌhaɪəˈɹɑːkɪkəl/, interconnect /ˌɪn.tə.kəˈnɛkt/, thermometer /θɚˈmɑ.mɪ.tɚ/

日本語話者が苦手な音：

/r/ と /l/ の区別 — /l/ は舌先を歯茎につけ、/r/ はどこにもつけない: hierarchical /ˌhaɪəˈɹɑːkɪkəl/, remotely /ɹɪˈmoʊtli/, illustration /ˌɪləsˈtɹeɪ̯ʃən/
/f/ — 「フ」ではなく、上の歯と下唇で出す: prefix /ˈpɹiːfɪks/, refrigerator /ɹɪˈfɹɪd͡ʒ.əˌɹeɪ.tɚ/, notification /ˌnoʊtɪfɪˈkeɪʃn̩/
子音の連続 — 間に母音を入れない: printer /ˈpɹɪntɚ/, disk /dɪsk/, interconnect /ˌɪn.tə.kəˈnɛkt/, pinpoint /ˈpɪnpɔɪnt/, prefix /ˈpɹiːfɪks/

この動画での練習方法

まず声を出さずに動画を最後まで聞き、知らない単語をメモします。
まず0.75倍速で一文ずつシャドーイングし、慣れてきたら通常の速度に戻します。
自分の声を録音して元の音声と比べます。module, connectivity, unpackなどの単語に特に注意しましょう。

シャドーイングとは？英語上達に効果的な理由

シャドーイング（Shadowing）は、もともとプロの通訳者養成プログラムで開発された言語学習法で、多言語習得者として知られるDr. Alexander Arguelles によって広く普及されました。方法はシンプルですが非常に効果的：ネイティブスピーカーの英語を聞きながら、1〜2秒の遅延で声に出してすぐに繰り返す——まるで「影（shadow）」のように話者を追いかけます。文法ドリルや受動的なリスニングと異なり、シャドーイングは脳と口の筋肉が同時にリアルタイムで英語を処理・再現することを強制します。研究により、発音精度、抑揚、リズム、連音、リスニング力、そして会話の流暢さが大幅に向上することが確認されています。IELTSスピーキング対策や自然な英語コミュニケーションを目指す方に特におすすめです。

シャドーイングのやり方: ステップ別の完全ガイドを読む →

シャドーイング練習: Network Devices - Hosts, IP Addresses, Networks - Networking Fundamentals - Lesson 1a - 動画で英語スピーキングを学ぶ

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