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networks, extra info - Coggle Diagram
networks
HTTP AND HTML
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When the computer sends information to the server, the server talks back to the computer in a laguage called HTTP, tht stands fot hyper text transfer protocol.
HTML: hyper text markup language. it is used to make a web look like that: change fonts, add images, change size.
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The internet is completely open, connections are shared, information is sent in complet text. safe websites prevent that prevent snooping and tampering using SSL and TLS.
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Certificate authorities: trusted entities that verify identities of websites and issue cetificate owners.
HOW SEARCH WORKS
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search engines are constantly scanning the web in advance to record the information you might need later.
the internet is a web of pages connected to eachother with hyperlinks, they run a program called the spider.
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ranking algorithm: ranks the pages on what it thinks you want. it cheks of the words are in the title, if the words are in sequence and if they are keywords.
page rank: take account if pages are linked in other pages, and they put it in the top.
SPAMMERS try to game the search to make enter their page, os they are on top of search results.
MACHINE LEARNING: artificial intelligence that lets computers learn without being explicitly programmed.
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IP ADDRESSES AND DNS
ISP: internet service provider, th ISP connects you to thousands of devices.
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All the deviced have different addresses. address in the internet is just a number. This is similar to how most homes have a mailing address.eache of the numbers is represented by bits, 32 bits.
this version of Ip address is called IPv4. Now we use IPv6 that contains which uses 128 bits per address.
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there are lots of DNS servers to transfer information between them. it is impossible for one DNS to have all the information.
DNS spoofing is when someone hacks into a DNS server and changes the IP address to a web.
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CYBERSECURITY AND CRIME
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ways for viruses to enter a computer: fake install, securty backdoor. a virus can steal and delete files, control programs.
digital army: botnet used to attack and take down websites. This attack is called DDoS, or distributed senial of service. when hackers overwhelm computers with to much information.
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INTERNET
nobody controls the internet, at the same time everyone does. The internet is made up of an incredily large of independently opereated networks.
there is no central control that decids how packets are routed or where pieces of the network are built, or who interconnects with whom
ARPANET: was another experiment like the internet, that stands for advanced research proyect agency network
extra info
A router helps you connect multiple devices to the Internet, and connect the devices to each other
Servers are computers that store webpages, sites, or apps. When a client device wants to access a webpage, a copy of the webpage is downloaded from the server onto the client machine to be displayed in the user's web browser
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