쉐도잉 연습: FREE CCNA Lab 001: Basic Router Security Configuration 1 - 영상으로 영어 말하기 배우기
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Welcome to this free Cisco CCNA Packet Tracer Practice Lab.
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You can download the lab file from the link in the description.
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See if you can complete the lab yourself first, and then continue watching this video if you have any trouble,
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or watch it afterwards to check your solution.
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In this lab, we will be working with two routers, R1 and R2.
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We will configure basic security on the routers by using the enable password, which is used to enter privileged exec mode,
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also known as enable mode.
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I will only work with one of the routers in this video for the sake of time,
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but I highly recommend that you perform the configurations on both of the routers for practice.
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Repetition is essential to become familiar with the command Handline Interface or CLI.
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Step 1 is to connect the two routers by their Gigabit Ethernet 00 interfaces.
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I will refer to these as the Gig00 interfaces.
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Click on Connections in the bottom left and select the cable.
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Connect it to the Gig00 interface on R1 and then R2.
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There we have it!
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Step 1 is complete.
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Step 2 is to set the host names according to the network diagram, that is to R1 and R2.
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Click on each router and then select CLI to access the command line interface from which we will configure each router.
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The current hostname for each router is displayed here.
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As you can see, each router is currently named Router.
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To change the hostname of a router, we must enter
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Global Configuration mode, however to get there we must first enter
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Privileged Exec mode.
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This is achieved by using the Enable command.
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To demonstrate a shortcut, I will use the exit command to return to the previous exec mode.
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Notice that you can enter privileged exec mode by simply typing en.
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You can also type en and then use tab to autocomplete it to enable, but this isn't necessary, en alone is fine.
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E, however, is too short, and we are told this is an ambiguous command.
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This is because there are other potential commands that begin with E, which we can see by typing E and then a question mark.
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As you can see, there are two potential commands, enable and exit.
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So if you just enter E, the router doesn't know which command you mean.
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However, enable is the only command beginning with en, so en is all the router needs to know which command you mean.
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Now that we are in privileged exec mode, we can use the configure terminal command to get to global configuration mode.
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If you want to use shortcuts again as we did with enable and en, the shortest version of the configure terminal command is conf t.
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From here we can set the hostname of the router.
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This is done with the hostname command.
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I will enter hostname R1.
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As you can see, the hostname has changed from router to R1.
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Change the hostname on R2 as well, and then step 2 is complete.
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Step 3 is to set the enable password on each router to Cisco.
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The enable password is used to enter privileged exec mode, which as I mentioned before is also called enable mode.
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Previously we had no password set, so we were able to enter privileged exec mode without any password.
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Now we are going to protect privileged exec mode so that only administrators can access it.
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The command is simple, and it is done in global configuration mode, which we are already in.
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Type enable password cisco.
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That's it.
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Now let's test it out.
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From here I will use the exit command twice.
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Once to bring me back to privileged exec mode, and then once again to bring me back to exec mode.
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Now I will use the enable command again.
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However, this time I am asked for a password.
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The characters do not appear as I type.
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However, if I type the password Cisco correctly and press enter, I am brought to privileged exec mode.
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Now let's see what happens if I fail to enter the correct password.
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I enter the wrong password once, twice, and then three times before being rejected for having bad secrets.
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Now I will try again with the correct password, and I'm in.
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Step 3 is now complete.
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Step 4 is simply to view the password in the running configuration.
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The running configuration is the current configuration of the router, whether or not you have actually saved it.
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If you turn off the router without saving the running configuration, you will lose any changes.
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If you want to keep your changes, you will save them to what's called the startup configuration.
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That will be for another lab.
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To view the running configuration, use the show running config command from privileged exec mode, which we are already in.
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You can abbreviate it to, for example, shrun.
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Enter the command, and you can see the password right here, with the exact command we used before, enable password cisco.
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Step 4 asks if the password is encrypted, meaning translated into an unreadable code,
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to protect it from being discovered by people who should not know the password.
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As you can see it is not encrypted, it is written in clear text right here,
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Cisco, so the answer is no. Step 4 is now complete.
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Step 5 is to enable password encryption on the router.
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We can protect passwords by encrypting them to render them unreadable.
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This is done from global configuration mode with the command service password hyphen encryption.
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I will enter the command and now step 5 is complete.
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Step 6 is to once again view the running config.
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I will use the same command as before, and now let's check the password.
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However, the command doesn't work.
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That is because we are currently in global configuration mode, and showrunnconfig must be entered from privileged exec mode.
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Now, I could type exit to drop back to privileged exec mode, and then enter the command.
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But there is one more way.
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If I type do in front of the command, I can enter it from global configuration mode.
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Do show running config.
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There we go.
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Let's look at the password.
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You can see here enable password followed by a 7 and then a string of other numbers.
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The password has successfully been encrypted.
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Although we didn't type this 7 when we entered the command, it refers to the type of encryption used.
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There are other types as well, but that's not something to worry about now.
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The string of numbers that follow are the password Cisco, encrypted to be unreadable, so that anyone looking over our shoulder can't read the password.
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Keep in mind that the encryption used in the Service Password Encryption command isn't very secure and can be cracked,
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but this at least renders the password safe from someone simply glancing over your shoulder.
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Step 6 is complete.
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Step 7 is to disable password encryption.
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We enabled password encryption with the Service Password Encryption command.
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Now we will simply type no, followed by the same command.
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No Service Password Encryption.
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That's it.
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Step 7 is now complete.
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Step 8 is once again to view the password in the running configuration.
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This time I'll exit down to privileged exec mode and type show running config to view the running configuration.
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As you can see, the password is still encrypted.
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Why is that, even though we disabled password encryption?
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Well, disabling password encryption will prevent future passwords from being encrypted.
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However, it does not unencrypt passwords that are already encrypted.
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So the answer to step 8 is yes, the password is encrypted.
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Step 8 and the lab are both now complete.
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If you want to support my channel, I accept Bitcoin donations via the address in the description.
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I am also a Brave verified publisher and accept BAT donations in the Brave browser.
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Thank you.
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이 레슨의 어휘와 말하기 포인트
이 말하기 레슨은 영상 “FREE CCNA Lab 001: Basic Router Security Configuration 1”을(를) 바탕으로 합니다. 가장 자주 반복되는 단어는 다음과 같습니다: password, command, mode, router, step. 이 영상에는 섀도잉할 문장 108개와 단어 1307개가 있습니다. 말하는 구간의 길이는 9:58입니다. 화자는 분당 약 131단어의 일정한 속도로 말해서 섀도잉하기에 편한 속도입니다. 영어에서 가장 많이 쓰이는 3,000단어에 속하는 단어가 78%뿐이라 어휘가 어려운 편입니다.
이 영상의 핵심 어휘
영상에 나오는 익혀 둘 만한 단어 15개를 발음, 뜻과 함께 정리했습니다.
| 단어 | 발음 | 뜻 |
|---|---|---|
| password 명사 | /ˈpæs.wɜɹd/ | 암호, 군호 |
| privilege 명사 | /ˈpɹɪv.(ɪ.)lɪd͡ʒ/ | 특권 |
| encryption 명사 | /ɪnˈkɹɪpʃən/ | 암호화 |
| exit 명사 | /ˈɛɡzət/ | 출구, 나가는 곳 |
| interface 명사 | /ˈɪn(t)ɚˌfeɪs/ | 인터페이스 |
| refer 동사 | /ɹɪˈfɜː/ | 언급하다 |
| select 동사 | /sɪˈlɛkt/ | 고르다 |
| string 명사 | /stɹɪŋ/ | 끈 |
| connect 동사 | /kəˈnɛkt/ | 잇다, 연결하다 |
| terminal 명사 | /ˈtɚmɪnəl/ | 터미널, 공항 터미널 |
| donation 명사 | /doʊˈneɪʃən/ | 기부금 |
| render 동사 | /ˈɹɛn.dɚ/ | 일어나게 하다, 하게하다 |
| crack 명사 | /kɹæk/ | 틈 |
| discover 동사 | /dɪˈskʌvə/ | 발견하다 |
| correctly 부사 | /kəˈɹɛk(t).li/ | 정확(正確)히 |
영상에 나오는 구동사
| 단어 | 뜻 |
|---|---|
| look over 동사 | 훑어보다 |
| turn off 동사 | 끄다, 턴오프하다 |
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 | is displayed · is achieved · are told |
| 현재완료 have/has + 과거분사 — 과거의 일이 지금도 관련이 있을 때 | has changed · have actually saved |
| 관계절 who / which + 절 — 사람이나 사물에 대한 추가 정보 | password, which is · people who should |
주의할 발음
화자는 doesn't, isn't, can't 같은 축약형과 약화된 형태를 8번 사용합니다. 들리는 대로 짧게 발음하세요.
- “sh”와 “zh” 소리: configuration /kənˌfɪɡ.əˈɹeɪ̯.ʃən/, encryption /ɪnˈkɹɪpʃən/, donation /doʊˈneɪʃən/, publisher /ˈpʌblɪʃɚ/, shortcut /ˈʃɔːtkʌt/
- 긴 단어 — 강세 위치에 주의: configuration /kənˌfɪɡ.əˈɹeɪ̯.ʃən/, successfully /səkˈsɛs.fə.li/, administrator /ədˈmɪn.ɪ.stɹeɪ.tɚ/, ambiguous /æmˈbɪɡ.ju.əs/, abbreviate /əˈbɹi.vi.eɪt/
한국어 화자가 어려워하는 소리:
- /f/ — ㅍ(/p/)으로 바꾸지 말고 윗니를 아랫입술에 대기: configuration /kənˌfɪɡ.əˈɹeɪ̯.ʃən/, interface /ˈɪn(t)ɚˌfeɪs/, refer /ɹɪˈfɜː/, successfully /səkˈsɛs.fə.li/, afterwards /ˈæf.tɚ.wɚdz/
- /v/ — ㅂ(/b/)과 구별하기: privilege /ˈpɹɪv.(ɪ.)lɪd͡ʒ/, discover /dɪˈskʌvə/, verify /ˈvɛɹɪfaɪ/, abbreviate /əˈbɹi.vi.eɪt/
- /z/ — ㅈ이 아니라 성대를 울리는 /s/: exit /ˈɛɡzət/, afterwards /ˈæf.tɚ.wɚdz/, translate /tɹænzˈleɪt/, browser /ˈbɹaʊ.zəɹ/
이 영상으로 연습하는 방법
- 먼저 말하지 않고 영상을 끝까지 듣고 모르는 단어를 적어 둡니다.
- 보통 속도로 한 문장씩 섀도잉하고, 화자의 리듬과 맞을 때까지 반복합니다.
- 자신의 목소리를 녹음해 원본과 비교하고, password, privilege, encryption 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.