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Grade 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.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?

  2. 2.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?

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

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

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

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

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

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

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

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

  7. 7.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

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

  8. 8.Two thousand people open the same page one morning. How many of that page is the machine holding it likely to be storing?

    • a) Two thousand, one for each visitor
    • b) Two thousand and one
    • c) One, and each visitor is sent a copy of it
    • d) None — each browser makes the page up for itself

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

  1. 1. 3
  2. 2. 2
  3. 3. b) Opening a file kept on the school's own lab network
  4. 4. b) Opening a page it has never opened before
  5. 5. b) The web is one of the things carried, and not the carrier itself
  6. 6. 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
  7. 7. 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
  8. 8. c) One, and each visitor is sent a copy of it