IP addresses are allocated by the network
Name:
Date:
Class:
A
Quick Questions
Shade in the A or B circle for each question.
1. Who gives a device its IP address?
2. A laptop moves from a school network to a home network. What happens to its IP address?
3. Which address is built into the NIC when it is made?
4. True or false: an IP address is set by the manufacturer at the factory.
5. Which statement about IP addresses is correct?
B
Match the Pairs
Draw a line connecting each item on the left to its match on the right.
| Left column | Right column | |
|---|---|---|
| 1Laptop at home: 192.168.1.20 -> Laptop at school: 10.0.5.47 | AThe same device gets a different IP address on a new network, because the network allocates the address. | |
| 2MAC address: 00:1A:2B:3C:4D:5E (stays the same on every network) | BWrong: the manufacturer gives the MAC address, not the IP address. The network the device joins allocates the IP address. | |
| 3An IP address is given to a device by the network it joins, not by the manufacturer. | CPhone joins Wi-Fi -> Router gives IP 192.168.0.12 | |
| 4An IP address is not built into the NIC, so it can change when the device moves to another network. | DTablet on café Wi-Fi: 172.16.4.9 / Tablet on home Wi-Fi: 192.168.1.8 | |
| 5The manufacturer sets the IP address of a device when it is made. | EWrong: the IP address is not built into the NIC. It depends on the network and changes when the device joins a new network. | |
| 6A device keeps the same IP address on every network because it is built into the NIC. | FAn address built into the NIC at manufacture, so unlike an IP address it does not change when the device joins a new network. |
C
Definitions
IP address allocation
D
Fill in the Blanks
Complete each line of code by filling in the missing parts.
1.
nic.macAddress ← manufacturer.assign()
device.ipAddress ← _______.allocate()
2.
IF newNetwork __ oldNetwork THEN
device.ipAddress ← newNetwork.allocate()
ENDIF
3.
joinNetwork(device, network)
device.ipAddress ← network.________()
OUTPUT device.ipAddress
4.
IF device.joinsNewNetwork ____
device.ipAddress ← network.allocate()
ENDIF
5.
nic.macAddress ← manufacturer.assign()
device._________ ← network.allocate()
E
Spot the Error
Shade in the letter of the line that contains an error.
Question 1
A
laptop.mac ← nic.mac
B
network ← join("SchoolWiFi")
C
laptop.ip ← nic.factoryIP()
Question 2
A
phone.ip ← maker.assign()
B
OUTPUT phone.ip
C
phone.mac ← nic.mac
Question 3
A
IF sameNetwork THEN
B
device.ip ← network.assign()
C
ENDIF
Question 4
A
home.ip ← homeNet.assign()
B
cafe.ip ← home.ip
C
OUTPUT home.ip, cafe.ip
Question 5
A
nic.mac ← "A4:5E:60:C1:09:7B"
B
ip ← network.assign()
C
OUTPUT "IP never changes"
Answer Key
IP addresses are allocated by the network
Section A: Quick Questions
Q1
B — The network the device joins
Q2
A — It is likely to change to a new one
Q3
A — MAC address
Q4
B — False
Q5
A — It depends on the network the device is connected to
Section B: Match the Pairs
Q1
Laptop at home: 192.168.1.20 -> Laptop at school: 10.0.5.47 → The same device gets a different IP address on a new network, because the network allocates the address.
Q2
MAC address: 00:1A:2B:3C:4D:5E (stays the same on every network) → An address built into the NIC at manufacture, so unlike an IP address it does not change when the device joins a new network.
Q3
An IP address is given to a device by the network it joins, not by the manufacturer. → Phone joins Wi-Fi -> Router gives IP 192.168.0.12
Q4
An IP address is not built into the NIC, so it can change when the device moves to another network. → Tablet on café Wi-Fi: 172.16.4.9 / Tablet on home Wi-Fi: 192.168.1.8
Q5
The manufacturer sets the IP address of a device when it is made. → Wrong: the manufacturer gives the MAC address, not the IP address. The network the device joins allocates the IP address.
Q6
A device keeps the same IP address on every network because it is built into the NIC. → Wrong: the IP address is not built into the NIC. It depends on the network and changes when the device joins a new network.
Section C: Definitions
Q1
IP address allocation — A device is given its IP address by the network it joins, not by the manufacturer, so it can change on a new network. Unlike a MAC address, it is not built into the NIC.Section D: Fill in the Blanks
Q1
nic.macAddress ← manufacturer.assign()
device.ipAddress ← network.allocate()Q2
IF newNetwork <> oldNetwork THEN
device.ipAddress ← newNetwork.allocate()
ENDIFQ3
joinNetwork(device, network)
device.ipAddress ← network.allocate()
OUTPUT device.ipAddressQ4
IF device.joinsNewNetwork THEN
device.ipAddress ← network.allocate()
ENDIFQ5
nic.macAddress ← manufacturer.assign()
device.ipAddress ← network.allocate()Section E: Spot the Error
Q1
C — An IP address is not built into the NIC. The network the laptop joins assigns it, so it should be network.assign().
Q2
A — The manufacturer does not give out IP addresses. The network the phone joins allocates its IP, so it should be network.assign().
Q3
A — A new IP address is allocated when the device joins a new network. The condition should be joinsNewNetwork, not sameNetwork.
Q4
B — The cafe network gives the device its own IP address. It does not reuse the home one. It should be cafe.ip ← cafeNet.assign().
Q5
C — The MAC address is built into the NIC and stays the same. The IP address depends on the network and can change. The output should say MAC never changes.