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Class 7 Computer Science — The internet and the web

Tell the internet apart from the web, and say what has to happen between two machines before a page appears on your screen.

Name: ________________________

  1. 1.Opening one page sends a request out and brings a copy of the page back. Counting the request going out and the page coming back, how many journeys across the network is that?

  2. 2.Messages were being carried between distant machines for years before the first web page was ever written. What does that tell you?

    • a) The web came first and messaging copied it
    • b) The two are simply different names for the same thing
    • c) Those early messages were a kind of web page
    • d) The web is one of the things carried, and not the carrier itself

  3. 3.Put these in the order they happen when someone opens a web page.

    • A copy of the page travels back
    • The address is typed in and entered
    • The browser draws the page on the screen
    • A request for that page travels out across the network
    • The machine holding the page finds the one that was asked for

  4. 4.Which of these cannot be done at all by a device that is joined to nothing?

    • a) Opening a page it has never opened before
    • b) Typing a letter and saving it
    • c) Drawing a picture in a paint program
    • d) Adding two numbers in a calculator app

  5. 5.Someone unplugs the cable that joins a school to the company supplying its connection. Which of these still works?

    • a) Opening a page from a site in another country
    • b) Opening a file kept on the school's own lab network
    • c) Joining a video call with another school
    • d) Sending a message to a school in the next city

  6. 6.Sort each job by whether the browser on your own device does it, or the machine holding the page does it.

    Groups: The browser · The machine holding the page

    • Starts the request off
    • Answers with a copy of the page
    • Reads the address that was typed in
    • Stores the page until somebody asks for it
    • Paints the words and pictures onto the screen
    • Picks out the right page from the ones it holds

  7. 7.Three friends each open the same page at the same time, and each of them receives their own copy of it. How many copies travel out?

  8. 8.A browser reports that the page could not be found. Which of these is the most likely reason?

    • a) The device has run out of storage
    • b) The machine answered, but has no page at that address
    • c) Every machine on the internet has been switched off
    • d) The browser is not allowed to draw pictures

Answer key — Class 7 Computer Science — The internet and the web

  1. 1. 2
  2. 2. d) The web is one of the things carried, and not the carrier itself
  3. 3. 1. The address is typed in and entered 2. A request for that page travels out across the network 3. The machine holding the page finds the one that was asked for 4. A copy of the page travels back 5. The browser draws the page on the screen
  4. 4. a) Opening a page it has never opened before
  5. 5. b) Opening a file kept on the school's own lab network
  6. 6. Reads the address that was typed in → The browser; Stores the page until somebody asks for it → The machine holding the page; Paints the words and pictures onto the screen → The browser; Picks out the right page from the ones it holds → The machine holding the page; Starts the request off → The browser; Answers with a copy of the page → The machine holding the page
  7. 7. 3
  8. 8. b) The machine answered, but has no page at that address