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The Internet, DNS, hosting and the cloud

OCR GCSE Computer Science (J277) · Computer systems (Paper 1) › Networks, connections and protocols › Networks and topologies

Practise The Internet, DNS, hosting and the cloud. 12 exam-style questions on this subtopic, at up to four difficulty levels, with full mark schemes and a progress tracker. Free, no account needed.

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Quick recall

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State what the letters DNS stand for.
Domain Name System (or Server)

Sample questions

Written for this site in the style of OCR exam questions. They are not taken from real past papers.

Question 1Easy3 marks
(a) State what is meant by the Internet.[1]
(b) State what the letters DNS stand for.[1]
(c) Which one of the following is an example of using cloud storage?
Tick (✓) one box.[1]
  • Saving a file on a remote server over the Internet
  • Saving a file on a USB flash drive
  • Saving a file on a laptop's solid state drive
  • Writing a file onto a DVD
Show the answer and mark scheme
(a)
  • a worldwide collection of (interconnected) computer networks
(b) Answer: Domain Name System (or Server)
  • Domain Name System / Domain Name Server
(c) Answer: Saving a file on a remote server over the Internet
Question 2Medium4 marks
Describe how DNS is used when a user types a website address (URL) into a web browser.[4]
Show the answer and mark scheme
  • the browser sends the domain name to a DNS server
  • the DNS server looks up the domain name in its records to find the matching IP address
  • if it does not have a record, the request is passed on to another DNS server
  • the IP address is sent back to the browser
  • the browser uses the IP address to request the web page from the web server
Question 3Hard4 marks
(a) Explain why the Domain Name System is needed.[2]
(b) A user can open a website by typing its IP address, but not by typing its domain name. Suggest the cause of the problem.[2]
Show the answer and mark scheme
(a)
  • people find domain names easier to remember than IP addresses
  • but computers / routers need the IP address to send data to the correct server
(b)
  • the DNS server is not working / cannot be reached / has an incorrect record
  • so the domain name cannot be converted into the IP address, even though the web server itself is working

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