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IT (The Internet: IP Addresses & DNS, The Internet: Packets, Routing…
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The Internet: Packets, Routing & Reliability
The way information is transferred from one computer to another is very interesting that you do not need to follow a fixed path.
In fact the path can change from computer to computer of a message information on the internet goes from computer to another in what we call a packet of information
a packet travels from one place to another on the internet as you go from one place to another on a car depends on the traffic or road conditions that you choose or that make you take a different route to get to the same place each time you travel and just as you can transport all your things inside the car many types of digital information can be sent as packets of IP but there are limits
On the internet the details work similarly if you have a large image that you want to send to your friend or upload to the website that image can be made in millions of bits of 1's and 0's many to send in a packet as it is information in the computer the computer sending the image can quickly separate it into hundreds or even thousands of small parts called packages and like cars
The Internet: Packets, Routing & Reliability
When a website asks your browser for a secure connection, it first provides you with a digital certificate, which is like an official identity document that the website is who it claims to be.
Digital certificates are issued by certificate authorities, which are trusted entities that verify the identities of websites and issue certificates to them. In the same way that a government can issue identity documents and passports.
If a website tries to establish a secure connection without a proper digital certificate, your browser will warn you. This is the basics of web browsing
These packets are made of binary code, sequences of 1s and 0s that are physically sent through electrical cables, fiber optics, and wireless networks. Fortunately, once you've learned how an internet layer works, you can depend on it without remembering all the details. And you can trust that all of these layers will work together to deliver information successfully at scale and with confidence.
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The internet: Wires,cables and WIFI
Today we physically send bits through electricity, light and radio waves. To send a bit by electricity, imagine that you have two bulbs connected with a copper wire. If an operator turns on a device the light turns on.
Instead of boxes and envelopes, the internet sends binary information
With ethernet wire, the kind you find in your home or office or school, you'll see a lot of lost signal or interference over a few tens of feet. If we want the Internet to work around the world, we need a different way of sending information over long distances. Like across the ocean.
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