You have asked the following question why do computers need to periodically check the dns for websites you have already visited
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  • Similar to the simulation in the getting started section this is Because there is no Dns and Ip addresses are constantly changing [3]
  • Use the Internet simulator to send requests to the built-in Dns to get the Ip addresses of other computers in the network [1]
  • Dns an abbreviation for domain name system the Internet's system for converting alphabetic names into numeric Ip addresses [1]
  • When you visit any web site on the Internet you can either type in the Ip Address or you can enter in the domain name like www.online-tech-tips.com [7]
  • This option cannot be used for remote connections obviously Since it’s just redirecting to another url [7]
  • If though our browser can&apost find the Ip Address that it is looking for locally it has to reach out and contact its recursive Dns server [4]
  • After the Dns has returned an Ip Address you can type that Ip Address into the to field enter a message and then press send. [1]
  • At its core the Dns is simply a hierarchical system of computers and databases that maps Ip addresses to domain names [3]
  • So why doesn’t everyone have a static Ip Address well it’s basically a lot cheaper for isps to keep rotating Ip addresses to their clients [7]
  • Which of the following is not solved by Dns a it’s inefficient to have everyone on the Internet maintain their own list of Ip addresses [1]
  • 6.1.1g - the domain name system Dns translates names to Ip addresses [1]
  • Direct students to the Internet simulator and distribute Dns partner questionnaire - activity guide or direct students to the online document [1]
  • Instead they should send a request to the Dns to make sure that the Ip Address is correct every time they want to send a person a message [1]
  • There are Dns servers all over the world that keep track of which names correspond to which numeric Ip addresses [7]
  • Discover how Dns translates human-readable locations on the Internet into a numeric Ip Address [1]




More detailed answers below ...


Dns in


  • Distribute research Dns In the real world - Activity guide one copy per student [1]
  • Research Dns In the real world - Activity guide [1]
  • The Internet simulator [1]
  • Research Dns In the real world - Activity guide download [1]

Dns partner


  • Direct students to the Internet simulator and distribute Dns Partner questionnaire - Activity guide or direct students to the online document [1]
  • Questionnaire - Activity guide download [1]
  • Questionnaire - Activity guide [1]

Dns records


  • Let&aposs now dive into the specific kinds of Dns Records that you may encounter or have to change for your own websites [4]
  • There are other types of Dns Records but these are the ones that seem to be encountered most often in the wild [4]
  • Have a ttl or time to live setting [4]
  • There are two big components we see in Dns Records - hostnames and time to live numbers [4]

Dns -


  • Video Ip and Dns - start at 4 12 [1]
  • The service that translates urls to Ip Addresses [1]

Dns protocol


  • Let students try the Dns Protocol to get the Address of someone who is attached to their router [1]
  • Students then briefly experiment with a Dns Protocol in the Internet simulator [1]
  • Students will then briefly experiment with a Dns Protocol in the getting started section [3]

Dns is


  • At its core the Dns Is simply a hierarchical system of computers and databases that maps Ip Addresses to domain names [3]
  • Give a few reasons why Dns Is useful and necessary [3]

Ip addresses


  • Similar to the simulation in the getting started section this is Because there is no Dns and Ip Addresses are constantly changing [3]
  • Use the Internet simulator to send requests to the built-in Dns to get the Ip Addresses of other computers in the network [1]
  • At its core the Dns is simply a hierarchical system of computers and databases that maps Ip Addresses to domain names [3]
  • So why doesn’t everyone have a static Ip Address well it’s basically a lot cheaper for isps to keep rotating Ip Addresses to their clients [7]
  • Why don't we need to know the Ip Addresses for our favorite sites [1]
  • Why don’t we need to know the Ip Addresses for our favorite sites [1]
  • 3. why don't we need to know the Ip Addresses for our favorite sites [3]
  • Instruct students to walk around the room and try to fill out the worksheet with a list of Ip Addresses and names for all students in the room [3]
  • B there are too few Ip Addresses to meet the current demand [1]
  • There are too few Ip Addresses to meet the current demand [3]
  • Students should understand that this is a realistic scenario -- Ip Addresses change all the time [3]

Ip address


  • When you visit any web site on the Internet you can either type in the Ip Address or you can enter in the domain Name like www.online-tech-tips.com [7]
  • If though our browser can&apost find the Ip Address that it is looking for locally it has to reach out and contact its recursive Dns server [4]
  • After the Dns has returned an Ip Address you can type that Ip Address into the to field enter a message and then press send. [1]
  • So why doesn’t everyone have a static Ip Address well it’s basically a lot cheaper for isps to keep rotating Ip Addresses to their clients [7]
  • Instead they should send a request to the Dns to make sure that the Ip Address is correct every time they want to send a person a message [1]
  • When an Ip Address changes there is no visual cue to anyone else on the Internet that the person they are talking to has moved [1]
  • One component an a record for a domain stores an Ip Address for a specific hostname such as [4]
  • Internet connection with Ip Address only without Dns [3]
  • Each student shoukd recieve one copy of the names and Addresses worksheet and one Ip Address cut-out from the Ip Address labels resource [3]
  • In order to communicate with someone else you must first find their Ip Address by asking the Dns [1]
  • When you have retrieved the Ip Address start the interview [1]

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why do computers need to periodically check the dns for websites you have already visitedsource:https://scotch-res.cloudinary.com/image/upload/w_auto,q_auto:good,f_auto/media/3/UCRmecS8RalaNvVGNdPc_dns-explained.png

why do computers need to periodically check the dns for websites you have already visitedsource:https://www.lifewire.com/thmb/mKT1-YWn0Svbr1hc11t35jcWPLU=/3865x2576/filters:fill(auto,1)/detail-of-orange-cables-in-a-server-room-130899950-57ac95663df78cf45994b514.jpg




References

  1. https://curriculum.code.org/csp-1718/unit1/12/
  2. https://scoutingweb.com/why-do-computers-need-to-periodically-check-the-dns-for-websites-you-have-already-visited/
  3. https://quorumlanguage.com/lessons/code/internet/InternetLesson12.html
  4. https://scotch.io/tutorials/dns-explained-how-your-browser-finds-websites
  5. https://www.lifewire.com/what-is-a-dns-server-2625854
  6. https://www.wsj.com/articles/how-denial-of-service-attacks-wreak-havoc-on-websites-1477076597
  7. https://www.online-tech-tips.com/computer-tips/ddns-dynamic-dns-service/
  8. https://disconnect.me/help
  9. https://developers.google.com/speed/public-dns/docs/troubleshooting

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