← ACARA Digital Technologies Years 7–8

Wired vs wireless: reliability

How steadily a connection stays working. Wired is usually more reliable as interference affects it less, while wireless signals can drop out.

Part of: ACARA Digital Technologies Years 7–8 — Wired and Wireless Networks — Module 24, WA Computer Science ATAR Year 11 — Network Communications — Module 88

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

What it does: The code shows wired reliability as high, matching the idea that cables are less affected by interference. The condition shows interference causing a wireless signal to drop out. Microwave ovens can interfere with Wi-Fi signals. This can slow the connection or make it drop out. A cable that is bent, chewed or cut can stop the connection working. A neighbour's phone mostly affects wireless signals. Wired connections are usually steadier, so they suit tasks that cannot afford to drop out. A wired device does not use Wi-Fi. A damaged or loose cable is a common reason for losing a wired connection.

Common mistakes: Wired connections are less affected by interference, so they are usually more reliable. The line should set reliability to "high". A wireless connection has no cable, so the main risk is that the signal can drop out. The line should be risk ← "signal can drop out".

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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 type of connection is usually more reliable?
Wired, because it is less affected by interferenceWireless, because signals never drop out
Matches
Wireless is always more reliable than wired because it has no cables.
↓
Wireless is usually less reliable, not more. Having no cable does not make it steadier. Its signal travels through the air, so walls, other devices and distance can cause interference and dropouts.
Applying
Meanings
Term
reliability
Meaning
How steadily a connection stays working. Wired is usually more reliable as interference affects it less, while wireless signals can drop out.
Practice
IF connection = "wireless" AND interference = "high" THEN
Testing
Gaps
IF interference = "high"
Check Answer
Spots
3 interference ← "low"
4 reliability ← "low"

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Quick Questions

1. Which type of connection is usually more reliable?
A. Wired, because it is less affected by interference ✓
B. Wireless, because signals never drop out
Wired connections are usually more reliable. Signals travel inside a cable, so interference affects them less.
2. A student's video call freezes when someone uses the microwave nearby. What is the most likely cause?
A. The cable has run out of data
B. Interference with the wireless signal ✓
Microwave ovens can interfere with Wi-Fi signals. This can slow the connection or make it drop out.
3. Which statement about dropped connections is true?
A. Wireless signals can drop out more often than wired ones ✓
B. Wired connections drop out more often than wireless ones
Wireless signals travel through the air, so walls, distance and other devices can make them drop out.
4. Which is a reliability risk for a wired connection?
A. A damaged or cut cable ✓
B. A neighbour's phone nearby
A cable that is bent, chewed or cut can stop the connection working. A neighbour's phone mostly affects wireless signals.
5. Why can a thick wall cause a wireless connection to drop out?
A. It makes the wireless signal travel faster
B. It can block or weaken the wireless signal ✓
Walls and other objects can weaken wireless signals, which can cause a dropped connection.

Match the Pairs

reliability → How steadily a connection stays working without dropping out or slowing down
dropped connection → A wireless link that suddenly cuts out, often because of weak signal or interference
Wired connections are usually more reliable because interference affects them less → wired.reliability = "high"
Wireless signals can drop out when interference gets in the way → if interference == true: wireless = "drops out"
Wireless is always more reliable than wired because it has no cables. → Wireless is usually less reliable, not more. Having no cable does not make it steadier. Its signal travels through the air, so walls, other devices and distance can cause interference and dropouts.
A wired network can never lose connection. → Wired networks can still fail. A cable that is bent, cut, crushed or unplugged can break the connection, so cable damage is a wired risk. They are just usually more reliable.

Key Term

reliability
How steadily a connection stays working. Wired is usually more reliable as interference affects it less, while wireless signals can drop out.

Fill in the Blanks

1. IF interference = "high" THEN connection ← "dropped" END IF
Hint: Type the keyword that introduces what happens when the condition is true.
2. IF cable = "damaged" THEN connection ← "lost" END IF
Hint: Type the pseudocode assignment symbol that stores a value in a variable.
3. IF signal < 20 THEN status ← "dropped" END IF
Hint: Type the comparison operator meaning the wireless signal is lower than 20.
4. IF type = "wireless" THEN risk ← "interference" ELSE risk ← "cable damage"
Hint: Type the keyword that gives the other choice when the first condition is false.
5. IF signal = "lost" OR cable = "cut" THEN alert ← "no connection" END IF
Hint: Type the logical operator that is true when either one of the two problems happens.

Spot the Error

Question 1
A connection ← "wired"
B IF connection = "wired" THEN
C interference ← "low"
D reliability ← "low"
E ENDIF
Line D — Wired connections are less affected by interference, so they are usually more reliable. The line should set reliability to "high".
Question 2
A connection ← "wireless"
B IF connection = "wireless" THEN
C risk ← "cable can break"
D ENDIF
Line C — A wireless connection has no cable, so the main risk is that the signal can drop out. The line should be risk ← "signal can drop out".
Question 3
A connection ← "wired"
B cableDamaged ← true
C IF NOT cableDamaged THEN
D status ← "disconnected"
E ENDIF
Line C — Damage to a cable is a risk for wired networks. The connection is lost when the cable IS damaged, so the condition should be IF cableDamaged THEN.
Question 4
A interference ← 8
B IF interference < 5 THEN
C wifi ← "may drop out"
D ENDIF
Line B — Wi-Fi drops out when interference is high. With a value of 8, the test should be interference > 5, not < 5.
Question 5
A mostReliable ← "wireless"
B reason ← "less interference"
C OUTPUT mostReliable, reason
Line A — Wired connections are usually more reliable because interference affects them less. Wireless signals are the ones that can drop out, so the value should be "wired".

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