How a Web Page Reaches Your Screen · seed 1 · A4, ink-friendly. The answer key prints on its own page for grown-ups.

Knock, ask, build

Computing · Computer Systems · ages 15-16
Name ______________________   Date ____________

  1. What does DNS hand back for wikipedia.org?

    • Its matching address number
    • The whole page at once
    • A new browser

  2. What happens first after you press enter?

    • The server builds the page
    • The browser looks up the address
    • The browser shows the page

  3. DNS fails but the site runs fine. What do you see?

    • The page as normal
    • A faster page
    • No page, since the browser never learns where to knock

  4. Which side stores the site's files?

    • The browser
    • The server
    • The screen

  5. Which files shape colours and layout?

    • CSS
    • HTML
    • DNS

  6. What does a 504 Gateway Timeout mean?

    • The name lookup spelled wrong
    • The browser forgot the address
    • The server took too long, so the browser gave up

  7. The browser stores each site forever, so servers can retire.

    Circle one:   True   False

  8. What does Destination Host Unreachable mean?

    • The server answered too slowly
    • The request found no path to its server
    • The page holds no words
LightMySky · lightmysky.comW1-mt_8JveAW2Mg7-s1

Answer key

For grown-ups. Fold this page away before handing over the rest.

Knock, ask, build W1-mt_8JveAW2Mg7-s1

  1. Its matching address number · DNS looks the name up in its phone book and returns the number.
  2. The browser looks up the address · Names must become numbers before any request can leave.
  3. No page, since the browser never learns where to knock · With no number to knock on, the request never leaves.
  4. The server · The server keeps the files and hands them over on request.
  5. CSS · CSS paints colours and layout over the HTML structure.
  6. The server took too long, so the browser gave up · A 504 means the reply half of the trip never came.
  7. False · Servers keep the files. The browser only borrows and builds.
  8. The request found no path to its server · The request left but no route led where it needed to go.
Worksheet · LightMySky