跟讀練習: How to configure port security on cisco switch | Port security - 通過影片學習英語口語

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Hello friends, welcome to my youtube channel, this is Prasad and today we will look at port security configuration on Cisco switches.

So basically port security enables

you to configure each switch port with a unique list of the mac addresses of the devices

that are authorized to access the network through that port.

This security enables individual ports to detect, prevent and log attempts by unauthorized devices to communicate through the switch.

Configuring the IP address of Class C network.

Enable configure terminal interface range fastethernet 0 slash 1 to 5.

Now we need to configure the switch port as an access

port using the switch port mode access command by default all ports are in dynamic mode

you can see here past ethernet is a dynamic port

so type the command switch port mode access

then activate port security on the switch port with the switch port port security command switch port port security

now switch port port security question mark

Here are the some options as edging MAC address maximum violation.

So I am choosing MAC address first?

First option 48 bit MAC address.

This indicates that you can enter the MAC address manually

and sticky means it is a port security feature that learns MAC addresses on an interface and retains the MAC information.

When you enter this command, the interface converts all the dynamic secure MAC addresses

including those that were dynamically learned before sticky learning was enabled to sticky secure MAC addresses.

Next command is switch port port security maximum.

Max secure addresses.

For security reason I want to allow only one identified device so I am selecting one.

Now we need to set violation command switch port, port security, violation.

Here are three options protect, restrict, shutdown.

We can either use restrict shutdown or protect port security commands.

So protect mode drop the packets with unknown source MAC addresses

until you remove enough secure MAC addresses to drop below the maximum value.

So we have already set the max value as 1.

An interface is allowed only one mac address of the source device.

Restrict mode performs the same function as protecting and shutdown causes the interface to enter an error disable state immediately.

Port will be shut down.

So I am choosing restrict mode, no shut and write show running config.

You can see here that no MAC address has been detected by any interface gate.

So let's wait for 30 seconds or check if your connectivity is fine.

Connectivity is working fine.

Navigate the MAC address on the interface.

Now I am going to create some violations so connecting this laptop to port number 0 5

now check the connectivity status see the connectivity is not established

now connect the cable again your previous device

we can get the reply from the device

so we are done with the port security configuration thanks for watching see you in the next video

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本課的詞彙與口語要點

這節口語課以影片“How to configure port security on cisco switch”為素材。影片中反覆出現的詞有：port, mac, security, switch, address。這段影片共有 42 個句子、482 個單詞可供跟讀。講話部分時長為 5:25。說話人語速較慢，每分鐘約 89 個詞，你有足夠的時間模仿每一個音。只有 78% 的單詞屬於英語最常用的 3,000 詞，詞彙難度較高。

影片中的重點詞彙

影片中 15 個值得學習的單詞，附發音和釋義：

單詞	發音	釋義
interface 名詞	/ˈɪn(t)ɚˌfeɪs/	介面
violation 名詞	/ˌvaɪ.əˈleɪ.ʃən/	違規 /違規
restrict 動詞	/ɹɪˈstɹɪkt/	限制, 制限
connectivity 名詞		連通性 /連通性, 連線性 /連線性
sticky 形容詞	/ˈstɪki/	黏
shutdown 名詞		關機 /關機, 關閉 /關閉
connect 動詞	/kəˈnɛkt/	連線 /連線
detect 動詞	/dɪˈtɛkt/	察覺 /察覺, 發覺 /發覺
configuration 名詞	/kənˌfɪɡ.əˈɹeɪ̯.ʃən/	編排 /編排, 配置
gate 名詞	/ˈɡeɪ̯t/	門口 /門口, 門 /門
establish 動詞	/ɪˈstæb.lɪʃ/	確定 /確定
select 動詞	/sɪˈlɛkt/	選 /選, 挑選 /挑選
indicate 動詞	/ˈɪndɪˌkeɪt/	表明, 表示
terminal 名詞	/ˈtɚmɪnəl/	航站, 航廈 /航廈
default 名詞	/dɪˈfɔlt/	違約 /違約, 暴雷

影片中的語法

說話人最常用的結構，並附上影片中的原話：

結構	影片中的用法
被動語態 be + 過去分詞 — 強調發生了什麼，而不是誰做的	are authorized · was enabled · is allowed
現在完成時 have/has + 過去分詞 — 過去發生但與現在仍有關聯的事	have already set · has been detected

需要注意的發音

“sh” 和 “zh” 音: violation /ˌvaɪ.əˈleɪ.ʃən/, configuration /kənˌfɪɡ.əˈɹeɪ̯.ʃən/, establish /ɪˈstæb.lɪʃ/
長單詞——注意重音位置: violation /ˌvaɪ.əˈleɪ.ʃən/, configuration /kənˌfɪɡ.əˈɹeɪ̯.ʃən/, communicate /kəˈmjuːnɪkeɪt/, manually /ˈmænj(u)əliː/

中文母語者容易讀錯的音：

/v/ — 不要讀成 /w/，上齒輕觸下唇: violation /ˌvaɪ.əˈleɪ.ʃən/, convert /kənˈvɝt/, activate /ˈæktɪˌveɪt/, navigate /ˈnæv.ɪ.ɡeɪt/
詞尾子音 — 要讀清楚，後面不要加母音: interface /ˈɪn(t)ɚˌfeɪs/, restrict /ɹɪˈstɹɪkt/, dynamic /daɪˈnæm.ɪk/, connect /kəˈnɛkt/, detect /dɪˈtɛkt/
/æ/ — 嘴張大，不要讀成 /e/: dynamic /daɪˈnæm.ɪk/, establish /ɪˈstæb.lɪʃ/, laptop /ˈlæp.tɑp/, packet /ˈpæk.ɪt/, activate /ˈæktɪˌveɪt/

如何用這段影片練習

先完整聽一遍影片，不要開口，記下不認識的單詞。
用正常速度逐句跟讀，每句重複到你的節奏與說話人一致為止。
錄下自己的聲音並與原聲對比，特別注意 interface, violation, restrict 這類單詞。

什麼是跟讀法？

跟讀法 (Shadowing) 是一種有科學依據的語言學習技巧，最初開發用於專業口譯員的培訓，並由多語言者Alexander Arguelles博士普及。這個方法簡單而強大：您在聽英語母語原聲的同時立即大聲重複——就像是一個延遲1-2秒緊跟說話者的影子。與被動聽力或語法練習不同，跟讀法強迫您的大腦和口腔肌肉同時處理並模模擬實的講話模式。研究表明它能顯著提高發音準確性，語調，節奏，連讀，聽力理解和口語流利度——使其成為雅思口語備考和真實英語交流最有效的方法之一。

影子跟讀法: 閱讀完整分步指南 →

跟讀練習: How to configure port security on cisco switch | Port security - 通過影片學習英語口語

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