Network hub

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Quick Questions

Shade in the A or B circle for each question.

1. A network hub has several ports. What do you plug into those ports?

A Only one cable from one device

B Cables from several wired devices

2. A computer sends a message to a hub. What does the hub do with it?

A Passes it on to every connected device

B Sends it only to the device it is meant for

3. Which device sends a message to just ONE device?

A A network hub

B A network switch

4. Which sentence describes a hub best?

A A simple box that joins wired devices

B A clever box that picks one device to send to

5. Four computers are plugged into a hub. Computer 1 sends a file. Who gets a copy of the message?

A Computers 2, 3 and 4

B Only Computer 3

Match the Pairs

Draw a line connecting each item on the left to its match on the right.

Left column		Right column
1hub		AA hub does not send to just one device. It passes the message to all connected devices. Sending to one device is what a switch does.
2switch		BA smarter box than a hub that sends each message to just the one device it is meant for
3A hub has several ports, so you can plug many cables into the one box		CA simple box with several ports that joins wired devices and passes every message on to all connected devices
4A hub sends every message to all connected devices, even ones that do not need it		Dhub.plug(cable1, cable2, cable3)
5hub.send(message, one_device)		EA hub is an older, simpler device, not a smart one. It cannot work out where a message should go.
6hub = newest_and_smartest_box		Fhub.send(message, all_devices)

Definitions

hub

Fill in the Blanks

Complete each line of code by filling in the missing parts.

connect(computer1, ___)

hub.send(message, ___)

switch.send(message, ___)

plug(cable, hub.____)

___ EACH device IN hub.ports send(message, device) END FOR

Spot the Error

Shade in the letter of the line that contains an error.

Question 1

A box = Hub(ports=1)

B box.plug(laptop)

C box.plug(printer)

Question 2

A message = 'Hello'

B hub.receive(message)

C hub.send_to_one(message)

Question 3

A hub.type = 'wireless tower'

B hub.cables = 'wired'

C hub.smart = False

Question 4

A message = 'Hi from Ava'

B for pc in hub.devices:

C pc.ignore(message)

Question 5

A switch = Switch(ports=8)

B switch.send_to(all_devices)

C hub.send_to(all_devices)

Answer Key

Network hub

Section A: Quick Questions

B — Cables from several wired devices

A — Passes it on to every connected device

B — A network switch

A — A simple box that joins wired devices

A — Computers 2, 3 and 4

Section B: Match the Pairs

hub → A simple box with several ports that joins wired devices and passes every message on to all connected devices

switch → A smarter box than a hub that sends each message to just the one device it is meant for

A hub has several ports, so you can plug many cables into the one box → hub.plug(cable1, cable2, cable3)

A hub sends every message to all connected devices, even ones that do not need it → hub.send(message, all_devices)

hub.send(message, one_device) → A hub does not send to just one device. It passes the message to all connected devices. Sending to one device is what a switch does.

hub = newest_and_smartest_box → A hub is an older, simpler device, not a smart one. It cannot work out where a message should go.

Section C: Definitions

hub — A simple box with several ports that joins wired devices. It passes every message on to all connected devices, unlike a switch, which sends it to just one.

Section D: Fill in the Blanks

connect(computer1, hub)

hub.send(message, all)

switch.send(message, one)

plug(cable, hub.port)

FOR EACH device IN hub.ports
  send(message, device)
END FOR

Section E: Spot the Error

A — A hub has several ports so that many wired devices can plug in. A hub with only one port could not join the laptop and the printer. It should be ports=4.

C — A hub passes every message on to all of the connected devices. It does not pick just one. The line should be hub.send_to_all(message).

A — A hub is a simple box with ports for cables. It is not a wireless tower. The line should be hub.type = 'simple box'.

C — A hub sends the message to every connected device, so each one receives it. The line should be pc.receive(message).

B — A switch sends a message to just one device. It is the hub that sends to all devices. The line should be switch.send_to(one_device).