Addresses on a Network: Naming a Machine and Naming a Page · seed 1 · A4, ink-friendly. The answer key prints on its own page for grown-ups.

Number for the machine, name for the page

Computing · Computing Fundamentals · ages 13-14
Name ______________________   Date ____________

  1. Which of these looks like an IPv4 address?

    • hello.world.page
    • 74.125.20.113
    • four numbers above 999

  2. Why does every device on a network need its own address?

    • So messages know exactly where to go
    • So devices look prettier
    • So the cables stay tidy

  3. Two machines on one network may share a single address with no harm.

    Circle one:   True   False

  4. Which part of a web address names the machine, and which names the page?

    • The page names the machine instead
    • Both parts name the page only
    • The domain names the machine, the path names the page

  5. In 24.147.242.217, the first part names the network and the last part names the machine. What is this layout like?

    • A phone number with country and area codes
    • A password with letters and symbols
    • A clock with hours and minutes

  6. A computer can send a web page request using only the name, with no lookup into a number.

    Circle one:   True   False

  7. Two laptops show the same address on one school network, and messages vanish. What is the soundest fix?

    • Shout the messages louder across the room
    • Give one laptop a different unique address
    • Share one address among all laptops

  8. A page will not load and the error says the name could not be resolved. What failed?

    • The screen brightness setting
    • The lookup turning the name into a number
    • The spelling of the page title
LightMySky · lightmysky.comW1-mt_tGgw0Vhd8b-s1

Answer key

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

Number for the machine, name for the page W1-mt_tGgw0Vhd8b-s1

  1. 74.125.20.113 · IPv4 is four numbers, each from 0 to 255, split by dots.
  2. So messages know exactly where to go · Without a unique address, the network cannot aim the message.
  3. False · A shared address leaves messages lost between two owners.
  4. The domain names the machine, the path names the page · The domain picks the machine, and the rest picks the page on it.
  5. A phone number with country and area codes · Each part narrows the target, from whole network down to one node.
  6. False · Networks route to numbers, so the name must become a number first.
  7. Give one laptop a different unique address · Unique addresses restore the promise, so each message finds one owner.
  8. The lookup turning the name into a number · No number means no destination, so nothing was ever sent.
Worksheet · LightMySky