← ACARA Digital Technologies Years 7–8

Wired vs wireless: security

Wired data stays in the cable, but wireless signals travel through the air where anyone in range can try to pick them up, so they need a password and encryption.

Part of: ACARA Digital Technologies Years 7–8 — Wired and Wireless Networks — Module 25, WA Computer Science ATAR Year 11 — Network Communications — Module 89, WA Computer Science ATAR Year 11 — Cyber Security — Module 28

Understanding Wired vs wireless: security in ACARA Digital Technologies Years 7–8

What it does: Radio signals pass through walls, so someone in the street or next door may be within range of the network. A cable keeps the data inside it, so the attacker needs to reach the cable or a port in person. A password stops strangers joining. Encryption scrambles the data so it cannot be understood if someone picks it up. Encryption changes the data into a coded form. Only devices with the right key can turn it back into readable data. Easy passwords are guessed quickly. A long and unusual one makes it much harder for someone in range to join.

Common mistakes: Wireless signals can be picked up by anyone in range, so encryption must be switched ON to scramble the data. It should be SET encryption ON. Data staying inside the cable and needing physical access to tap it describes a wired network. Wireless signals travel through the air. It should be IF network = wired THEN.

Class: _____________________  ·  Name: _____________________  ·  Date: _________

Free printable worksheet with full answer key — or add this module to a class and your students practise it interactively.

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This module's key terms are also in a printable crossword (Modules 54–68) and word search (Modules 13–68).

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Learning
Duo
Which network type sends data only along a cable, so an outsider cannot pick it up from a distance?
Wireless networkWired network
Matches
wifi.password = none # "Wi-Fi is safe without one"
↓
An open Wi-Fi network has no password or encryption, so anyone in range can connect or read the data. Set a strong password and use encryption.
Applying
Meanings
Term
wireless security
Meaning
Wired data stays in the cable, but wireless signals travel through the air where anyone in range can try to pick them up, so they need a password and encryption.
Practice
IF network = "wireless" THEN
Testing
Gaps
USE password AND
Check Answer
Spots
3 SET password ON
4 SET encryption OFF

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Quick Questions

1. Which network type sends data only along a cable, so an outsider cannot pick it up from a distance?
A. Wired network ✓
B. Wireless network
Wired data stays inside the cable. To tap it, someone would need physical access to the cable or a device plugged into the network.
2. Why do wireless networks need extra protection?
A. Signals travel through the air where others in range can try to pick them up ✓
B. Wireless signals only ever travel along a cable
Wireless signals spread out through the air, so anyone within range can try to receive them. That is why they need protection.
3. A Wi-Fi signal from a house can reach the street outside. What is the security risk?
A. The signal stops at the walls so no one outside can ever see it
B. Someone outside the building might pick up the signal ✓
Wireless signals often pass through walls and reach outside the building. A person in the street may be within range.
4. To tap into a wired network, what does an attacker usually need?
A. Just to stand within range of the building
B. Physical access to the cable or a network port ✓
Wired networks are harder to reach from outside. The attacker normally needs to get to the cable or plug into a port.
5. Which is the best way to protect a Wi-Fi network?
A. Use a strong password and encryption ✓
B. Leave it open so it is easy to join
A password stops strangers joining. Encryption scrambles the data so it cannot be understood if someone picks it up.

Match the Pairs

WPA3 + strong password → Encryption and a password protect wireless data so people in range cannot read it
cable.plugIn(port) → A person needs physical access to connect to a wired network
Wireless signals can reach outside the building, so people in range may try to pick them up → signalReach = "outside walls"
Wired data stays in the cable, so an attacker usually needs physical access to the cable or a port → access = "physical cable"
wifi.password = none # "Wi-Fi is safe without one" → An open Wi-Fi network has no password or encryption, so anyone in range can connect or read the data. Set a strong password and use encryption.
wiredNetwork = "anyone outside can read the cable data" → Wired data stays inside the cable, so someone outside the building cannot pick it up from the air. They would need physical access to the cable or a port.

Key Term

wireless security
Wired data stays in the cable, but wireless signals travel through the air where anyone in range can try to pick them up, so they need a password and encryption.

Fill in the Blanks

1. IF network = "wireless" THEN USE password AND encryption END IF
Hint: Type the word for scrambling data so people who pick up the signal cannot read it
2. IF network = "wireless" THEN DISPLAY "Signal reaches outside the house" END IF
Hint: Type the command that shows a message on the screen
3. IF password = "none" THEN DISPLAY "Anyone in range can join" END IF
Hint: Type the variable name that holds the secret login stopping strangers joining a Wi-Fi network
4. scrambled ← encrypt(message, key) readable ← decrypt(scrambled, key)
Hint: Type the function name that scrambles data so it cannot be read by others
5. IF physicalAccess = "no" THEN wiredData ← "cannot be tapped" END IF
Hint: Type the keyword that starts the instructions run when the IF condition is true

Spot the Error

Question 1
A IF network = wireless THEN
B anyone in range can listen
C SET password ON
D SET encryption OFF
E END IF
Line D — Wireless signals can be picked up by anyone in range, so encryption must be switched ON to scramble the data. It should be SET encryption ON.
Question 2
A IF network = wireless THEN
B data stays inside the cable
C need physical access to tap
Line A — Data staying inside the cable and needing physical access to tap it describes a wired network. Wireless signals travel through the air. It should be IF network = wired THEN.
Question 3
A network = wireless
B signal_leaves_building = TRUE
C risk_of_listening = NONE
Line C — Wireless signals pass through walls and reach outside the building, so the risk of someone listening in is high, not none. It should be risk_of_listening = HIGH.
Question 4
A IF has_access = TRUE THEN
B wired_data = SAFE
C ELSE
D wired_data = AT_RISK
Line A — Wired data is safe when a person has no physical access to the cable. The condition should be IF has_access = FALSE THEN.
Question 5
A SET wifi_name = HomeNet
B SET security = WPA3
C SET password = none
Line C — A Wi-Fi network needs a strong password so strangers in range cannot join. Having no password leaves it open. It should be SET password = strong.

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