跟读练习: How to configure port security on cisco switch | Port security - 通过视频学习英语口语

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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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本课的词汇与口语要点

这节口语课以视频“How to configure port security on cisco switch”为素材。视频中反复出现的词有：port, mac, security, switch, address。这段视频共有 42 个句子、482 个单词可供跟读。讲话部分时长为 5:25。说话人语速较慢，每分钟约 89 个词，你有足够的时间模仿每一个音。只有 78% 的单词属于英语最常用的 3,000 词，词汇难度较高。

视频中的重点词汇

视频中 15 个值得学习的单词，附发音和释义：

单词	发音	释义
interface 名词	/ˈɪn(t)ɚˌfeɪs/	接口
violation 名词	/ˌvaɪ.əˈleɪ.ʃən/	違規 /违规
restrict 动词	/ɹɪˈstɹɪkt/	限制, 制限
connectivity 名词		連通性 /连通性, 連接性 /连接性
sticky 形容词	/ˈstɪki/	黏
shutdown 名词		關機 /关机, 關閉 /关闭
connect 动词	/kəˈnɛkt/	連接 /连接
detect 动词	/dɪˈtɛkt/	察覺 /察觉, 發覺 /发觉
configuration 名词	/kənˌfɪɡ.əˈɹeɪ̯.ʃən/	編排 /编排, 配置
gate 名词	/ˈɡeɪ̯t/	門口 /门口, 門 /门
establish 动词	/ɪˈstæb.lɪʃ/	確定 /确定
select 动词	/sɪˈlɛkt/	選 /选, 挑選 /挑选
indicate 动词	/ˈɪndɪˌkeɪt/	表明, 表示
terminal 名词	/ˈtɚmɪnəl/	航站, 航廈 /航厦
default 名词	/dɪˈfɔlt/	違約 /违约, 暴雷

视频中的语法

说话人最常用的结构，并附上视频中的原话：

结构	视频中的用法
被动语态 be + 过去分词 — 强调发生了什么，而不是谁做的	are authorized · was enabled · is allowed
现在完成时 have/has + 过去分词 — 过去发生但与现在仍有关联的事	have already set · has been detected

需要注意的发音

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

中文母语者容易读错的音：

/v/ — 不要读成 /w/，上齿轻触下唇: violation /ˌvaɪ.əˈleɪ.ʃən/, convert /kənˈvɝt/, activate /ˈæktɪˌveɪt/, navigate /ˈnæv.ɪ.ɡeɪt/
词尾辅音 — 要读清楚，后面不要加元音: interface /ˈɪn(t)ɚˌfeɪs/, restrict /ɹɪˈstɹɪkt/, dynamic /daɪˈnæm.ɪk/, connect /kəˈnɛkt/, detect /dɪˈtɛkt/
/æ/ — 嘴张大，不要读成 /e/: dynamic /daɪˈnæm.ɪk/, establish /ɪˈstæb.lɪʃ/, laptop /ˈlæp.tɑp/, packet /ˈpæk.ɪt/, activate /ˈæktɪˌveɪt/

如何用这段视频练习

先完整听一遍视频，不要开口，记下不认识的单词。
用正常速度逐句跟读，每句重复到你的节奏与说话人一致为止。
录下自己的声音并与原声对比，特别注意 interface, violation, restrict 这类单词。

什么是跟读法？

跟读法 (Shadowing) 是一种有科学依据的语言学习技巧，最初开发用于专业口译员的培训，并由多语言者Alexander Arguelles博士普及。这个方法简单而强大：您在听英语母语原声的同时立即大声重复——就像是一个延迟1-2秒紧跟说话者的影子。与被动听力或语法练习不同，跟读法强迫您的大脑和口腔肌肉同时处理并模仿真实的讲话模式。研究表明它能显着提高发音准确性，语调，节奏，连读，听力理解和口语流利度——使其成为雅思口语备考和真实英语交流最有效的方法之一。

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跟读练习: How to configure port security on cisco switch | Port security - 通过视频学习英语口语

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