A router assigns IP addresses

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Date:

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Quick Questions

Shade in the A or B circle for each question.

1. A new phone joins the school Wi-Fi. What happens to its IP address?

A The router gives it an IP address automatically

B The student must type in an IP address by hand

2. Which device on a home network gives out IP addresses to the other devices?

A The monitor

B The router

3. A router gives out dynamic IP addresses. What does this mean?

A The address is given automatically when a device joins

B The address is permanently fixed to the device by hand

4. A laptop and a tablet are both connected to the same router. Which statement is true?

A Both devices share the same IP address

B Each device is given a different IP address

5. Why does the router assign IP addresses automatically?

A So users do not have to set up each device by hand

B So that every device has the same MAC address

Match the Pairs

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

Left column		Right column
1Phone joins Wi-Fi -> router gives 192.168.1.23		AOn a local network the router assigns addresses automatically, so nobody needs to type them in by hand.
2Laptop = 192.168.1.24, Phone = 192.168.1.23		BA new device joins the network and the router automatically gives it an IP address
3The router gives out dynamic IP addresses, so a device does not need to be set up by hand		Cnext_address = last_address + 1
4Every device that joins receives a different address from the router		Dip_address = router.assign()
5Technician types 192.168.1.50 into every new tablet by hand		EEach device on the network is given a different IP address by the router
6Router gives 192.168.1.30 to both the printer and the laptop		FTwo devices must never have the same IP address. The router gives each device a different address.

Definitions

router assigns IP

Fill in the Blanks

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

______.assignIP(newLaptop)

IF device.joined ____ router.assignIP(device) ENDIF

ipPhone = router.assignIP(phone) ipLaptop = router.assignIP(laptop) OUTPUT ipPhone __ ipLaptop

tabletIP = router.________(tablet) OUTPUT tabletIP

FOR ____ device IN network router.assignIP(device) NEXT device

Spot the Error

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

Question 1

A laptop <- NewDevice()

B laptop.joinNetwork()

C ip <- router.assignIP(laptop)

D laptop.ip = ip

Question 2

A IF newDevice.joined = TRUE

B ip <- router.assignIP()

C newDevice.ip <- ip

D ENDIF

Question 3

A router.mode <- "static"

B pc <- NewDevice("PC")

C ip <- router.assignIP(pc)

Question 4

A FOR EACH device IN newDevices

B ip <- user.typeIP(device)

C device.ip <- ip

D NEXT device

Question 5

A tablet <- NewDevice("Tablet")

B tablet.ip <- tablet.assignIP()

C OUTPUT tablet.ip

Answer Key

A router assigns IP addresses

Section A: Quick Questions

A — The router gives it an IP address automatically

B — The router

A — The address is given automatically when a device joins

B — Each device is given a different IP address

A — So users do not have to set up each device by hand

Section B: Match the Pairs

Phone joins Wi-Fi -> router gives 192.168.1.23 → A new device joins the network and the router automatically gives it an IP address

Laptop = 192.168.1.24, Phone = 192.168.1.23 → Each device on the network is given a different IP address by the router

The router gives out dynamic IP addresses, so a device does not need to be set up by hand → ip_address = router.assign()

Every device that joins receives a different address from the router → next_address = last_address + 1

Technician types 192.168.1.50 into every new tablet by hand → On a local network the router assigns addresses automatically, so nobody needs to type them in by hand.

Router gives 192.168.1.30 to both the printer and the laptop → Two devices must never have the same IP address. The router gives each device a different address.

Section C: Definitions

router assigns IP — A router on a local network gives each device that joins its own IP address automatically, so nobody sets it up by hand. Every device gets a different address.

Section D: Fill in the Blanks

router.assignIP(newLaptop)

IF device.joined THEN
    router.assignIP(device)
ENDIF

ipPhone = router.assignIP(phone)
ipLaptop = router.assignIP(laptop)
OUTPUT ipPhone != ipLaptop

tabletIP = router.assignIP(tablet)
OUTPUT tabletIP

FOR EACH device IN network
    router.assignIP(device)
NEXT device

Section E: Spot the Error

D — Assignment in this pseudocode uses the arrow <-, not =. The line should be laptop.ip <- ip, which stores the address the router gave the laptop.

A — An IF statement needs THEN at the end of its first line. It should be IF newDevice.joined = TRUE THEN, so the router assigns an address when a new device joins.

A — With static addressing, a person sets each address by hand. The router assigns addresses automatically in dynamic mode, so the line should be router.mode <- "dynamic".

B — The router gives each device its address automatically, so a user does not type it in by hand. The line should be ip <- router.assignIP(device).

B — The device does not give itself an address. The router on the network assigns it, so the line should be tablet.ip <- router.assignIP().