互联网工作原理

How the internet works and why it sometimes doesn't? 
We break down how the internet works, where it comes from, and why we keep experiencing more and more outages online.
tags: 科普 知识 网络 通讯
内容
  • 英中
  • 中英
  • 盲听
  • 1

    The internet has become essential to our everyday lives, but many of us have no idea how it actually works and what's going on when it doesn't.

  • 2

    Allison, can you explain what internet is? - Before it was called the internet, it was called the ARPANET in the sixties.

  • 3

    This network of computers was initially funded by the Department of Defense and used by the military and universities to access files and transmit information.

  • 4

    But by 1991, everyone was using the internet. And by 1997, Wifi was born. This video you're watching now likely traveled thousands of miles from one server in a data center to reach your device.

  • 5

    Or may have come from a closer server in a growing content delivery network. Data centers are rooms full of servers that store data and content.

  • 6

    Some are owned and operated by huge tech companies, like Facebook now known as Meta⁽¹⁾, while others provide service to smaller websites.

  • 7

    Data centers can be found all around the globe, but they're often located in remote areas like Council Bluffs, Lowa, and Papillion, Nebraska.

  • 8

    When you receive that notification, send that email or watch a cute cat video, that data is sent via fiber optic cables that criss-cross the sea floors, making the web worldwide.

  • 9

    These cables are super thick to protect the fragile optical fiber inside, but anchors, fishing boats and sea life can do a lot of damage.

  • 10

    For example, in 2014, sharks were mistaking Google's underwater cables for lunch. Undersea cables lead to around 800 landing points around the globe, giving you plenty of options for a broadband connection.

  • 11

    One is fiber optic, which is fast, but cables run from the internet service provider all the way to the customer's home or business, so it's not available in remote locations.

  • 12

    Some rural areas don't have access to a wired connection because it's not financially feasible for an internet service provider to lay cables in a lesser populated region.

  • 13

    Wireless internet often uses cell towers to get a connection, or they might even use satellites. Elon Musk recently released 48 satellites into space for his new broadband internet venture, Starlink.

  • 14

    But as technology continues to advance, it may feel like there are more outages than ever. And that's because there are.

  • 15

    As data services continue to move online, so do our digital lives and more chance for error like mechanical failures, glitches, bad software updates or even worse, hackers and ransomware.

  • 16

    But tech companies that offer cloud-based services are usually most at risk because they store all their customer's private data.

  • 17

    If a glitch hits one of these centralized internet services, boom, it affects every one of their customers.

  • 18

    Technology is constantly evolving and so are our habits. 31% of U.S. adults report that they go online almost constantly.

  • 19

    From the metaverse to avatars and beyond, the future of the internet and its reach seem limitless, but certainly not foolproof.

  • 1

    互联网已经成为我们日常生活必不可少的一部分,但我们中的许多人不知道它是如何工作的,当它不工作时发生了什么。

  • 2

    艾利森,你能解释一下什么是互联网吗? - 在它被称为互联网之前,它在60年代被称为阿帕网。

  • 3

    这个计算机网络最初是由国防部资助的,被军方和大学用来访问文件和传输信息。

  • 4

    但到了1991年,民众都用上了互联网。到了1997年,Wifi诞生了。你现在正在观看的这个视频可能是从数据中心的一台服务器长途跋涉数千英里到达你的设备的。

  • 5

    或者可能来自日益增长的内容分发网络中的一台更近的服务器。数据中心是放满存储数据和内容的服务器的房间。

  • 6

    其中一些(数据中心)由大型科技公司拥有和运营,比如现在被称为Meta的Facebook,而另一些(数据中心)则为较小的网站提供服务。

  • 7

    数据中心遍布全球,但通常位于偏远地区,如爱荷华州的康瑟尔布拉夫斯市、内布拉斯加州的帕皮利恩市。

  • 8

    当你收到通知、发送电子邮件或观看可爱的猫咪视频时,这些数据会通过纵横交错在海床上的光纤电缆发送,使网络通向全球。

  • 9

    这些电缆非常厚,可以保护里面脆弱的光纤,但是船锚、渔船和海洋生物会对其造成很大的破坏。

  • 10

    例如,在2014年,鲨鱼把谷歌的水下电缆误认为午餐。海底电缆通往全球约800个着陆点,为你提供了大量的宽带连接选择。

  • 11

    一种是光纤,它速度很快,但电缆从互联网服务提供商一直连接到客户的家庭或企业,因此在偏远地区是不可用的。

  • 12

    一些农村地区没有有线连接,因为互联网服务提供商在人口较少的地区铺设电缆在经济上是不可行的。

  • 13

    无线网络通常使用手机信号塔来连接,或者他们甚至可能使用卫星。埃隆·马斯克最近向太空发射了48颗卫星,用于他的新宽带互联网项目——星链。

  • 14

    但随着技术的不断进步,可能会出现比以往更多的中断。那是因为确实有(很多不可预知因素)。

  • 15

    随着数据服务持续在线,我们的数字生活也在在线,出现机械故障、小毛病、糟糕的软件更新,甚至更糟的是黑客和勒索软件等造成的错误的可能性也在增加。

  • 16

    但提供云服务的科技公司通常面临的风险最大,因为它们存储了客户的所有私人数据。

  • 17

    如果一个故障发生在这些集中的互联网服务中,它会影响到他们的每一个客户。

  • 18

    技术在不断发展,我们的习惯也是同样如此。31%的美国成年人表示他们几乎经常上网。

  • 19

    从元宇宙到虚拟人物,再到其他领域,互联网的未来及其覆盖范围似乎是无限的,但肯定不是万无一失的。