Dynamic IP address

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Quick Questions

Shade in the A or B circle for each question.

1. Who or what gives a device a dynamic IP address?

A The network assigns it automatically

B The user types it in by hand every time

2. A laptop disconnects from school Wi-Fi and joins again the next day. What may happen to its dynamic IP address?

A It is always exactly the same

B It may be different from the day before

3. Which statement about a dynamic IP address is true?

A It is permanently fixed to the device

B It can change each time the device connects

4. Phone A leaves the network. What can happen to the dynamic IP address it was using?

A It can be reused by another device

B It can never be used again by anyone

5. Which describes how a dynamic IP address is set up?

A Assigned automatically when the device connects

B Set manually by a technician for each device

Match the Pairs

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

Left column		Right column
1IP address: 192.168.1.23 (assigned by router when laptop joins Wi-Fi)		AWrong: a dynamic IP address is given automatically by the network. Typing in a fixed address by hand is how a static IP is set.
2Monday: 192.168.1.23 \| Tuesday: 192.168.1.41		BA dynamic IP address: the network gives it to the device automatically when it connects
3A dynamic IP address can be reused by another device after the first device disconnects		CDevice joins network -> router gives it the next free address
4A dynamic IP address is assigned automatically, not set by the user		DThe same device has a different IP address each connection, so the address is dynamic
5A dynamic IP address never changes, so it is the same every time you connect.		EWrong: a dynamic IP address may change each time the device connects. An address that never changes is a static IP address.
6The user must type in a dynamic IP address on each device before it can join the network.		FPhone leaves: 192.168.1.50 is free. Tablet joins: 192.168.1.50

Definitions

dynamic IP address

Fill in the Blanks

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

ip ← network.______(device)

IF device.connects = TRUE ____ ip ← network.assign(device) ENDIF

device.disconnect() network._______(oldIP)

ip1 ← network.assign(laptop) ip2 ← network.assign(laptop) OUTPUT ip1 _ ip2

newIP ← network.assign(phone) phone.ip ← _____

Spot the Error

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

Question 1

A ipType <- "dynamic"

B device CONNECT network

C address <- network.ASSIGN()

D OUTPUT "Address is manual"

Question 2

A ip1 <- network.ASSIGN()

B device DISCONNECT

C device CONNECT

D ip2 <- ip1

E OUTPUT ip2

Question 3

A device CONNECT network

B ip <- USER.TYPE()

C device DISCONNECT

D network.RELEASE(ip)

Question 4

A device1 DISCONNECT

B network.RELEASE(ip1)

C device2 CANNOT USE ip1

D OUTPUT "Address reused"

Question 5

A ipType <- "static"

B device CONNECT network

C ip <- network.ASSIGN()

Answer Key

Dynamic IP address

Section A: Quick Questions

A — The network assigns it automatically

B — It may be different from the day before

B — It can change each time the device connects

A — It can be reused by another device

A — Assigned automatically when the device connects

Section B: Match the Pairs

IP address: 192.168.1.23 (assigned by router when laptop joins Wi-Fi) → A dynamic IP address: the network gives it to the device automatically when it connects

Monday: 192.168.1.23 | Tuesday: 192.168.1.41 → The same device has a different IP address each connection, so the address is dynamic

A dynamic IP address can be reused by another device after the first device disconnects → Phone leaves: 192.168.1.50 is free. Tablet joins: 192.168.1.50

A dynamic IP address is assigned automatically, not set by the user → Device joins network -> router gives it the next free address

A dynamic IP address never changes, so it is the same every time you connect. → Wrong: a dynamic IP address may change each time the device connects. An address that never changes is a static IP address.

The user must type in a dynamic IP address on each device before it can join the network. → Wrong: a dynamic IP address is given automatically by the network. Typing in a fixed address by hand is how a static IP is set.

Section C: Definitions

dynamic IP address — An IP address given to a device automatically by the network each time it connects, so it may change and can later be reused by another device.

Section D: Fill in the Blanks

ip ← network.assign(device)

IF device.connects = TRUE THEN
    ip ← network.assign(device)
ENDIF

device.disconnect()
network.release(oldIP)

ip1 ← network.assign(laptop)
ip2 ← network.assign(laptop)
OUTPUT ip1 ≠ ip2

newIP ← network.assign(phone)
phone.ip ← newIP

Section E: Spot the Error

D — A dynamic IP address is assigned automatically by the network, not set manually. The line should say the address is automatic.

D — With a dynamic IP address the network assigns a new address each time the device connects, so it may differ. ip2 should be ip2 <- network.ASSIGN(), not a copy of ip1.

B — The network gives out a dynamic IP address automatically. The user does not type it in. The line should be ip <- network.ASSIGN().

C — Once device1 disconnects, its dynamic address is released and can be reused by another device. It should say device2 CAN USE ip1.

A — The network assigns the address automatically, so the type is dynamic. A static address is fixed and does not change. It should be ipType <- "dynamic".