4.1c Wired & Wireless Networks — Edexcel 1CP2

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Wired vs Wireless Networks

Devices on a network can be connected using wired (physical cables) or wireless (radio waves) connections. Each has distinct advantages and disadvantages.

Wired Networks

Wired networks use physical cables to connect devices. The most common standard is Ethernet (using twisted-pair copper cables or fibre optic cables).

Twisted-pair copper cable (Ethernet/Cat5/Cat6): cheap, widely used in homes and offices
Fibre optic cable: uses light signals instead of electrical signals — much faster and longer distances, but more expensive
Wired connections are more reliable — not affected by interference
Faster and more secure than wireless
Devices must be physically connected — less flexible

Wireless Networks

Wireless networks use radio waves (Wi-Fi). The wireless standard used in LANs is Wi-Fi (IEEE 802.11). Devices need a Wireless Access Point (WAP) or wireless router to connect.

Devices can move freely within range
Easy to add new devices without running cables
More susceptible to interference (from walls, other devices, microwaves)
Range is limited — signal weakens with distance
Less secure than wired — easier to intercept signals
Speed may be lower and more variable than wired

Wired vs Wireless Comparison

Factor	Wired	Wireless
Speed	Generally faster, stable	Slower, variable
Reliability	More reliable, no interference	Can be affected by walls, other devices
Security	More secure (physical access needed)	Less secure (signals can be intercepted)
Cost	More expensive (cables, installation)	Cheaper to set up (no cabling)
Flexibility	Devices must be physically connected	Devices can move freely
Setup	More complex, cables needed	Easier to set up, just need a WAP

Network Hardware

Several hardware components are needed to build a network:

Component	Function
Router	Connects networks together (e.g. home network to the internet); assigns IP addresses
Switch	Connects devices within a LAN; sends data to the correct device using MAC addresses
Wireless Access Point (WAP)	Allows wireless devices to connect to a wired network
Network Interface Card (NIC)	Hardware in a device that allows it to connect to a network; has a unique MAC address
Modem	Converts digital signals to analogue (and back) for transmission over telephone lines
Ethernet cable	Physical cable used in wired networks (twisted-pair copper)
Fibre optic cable	Cable that carries data as light signals — very fast, long distances

Exam tip: When asked to "compare wired and wireless", always cover speed, reliability, security, cost, and flexibility. Use comparative language: "wired is faster than wireless but less flexible."

⚠️ Common Mistakes

Saying wireless is "more secure" — it is LESS secure because signals can be intercepted
Forgetting that a WAP (Wireless Access Point) is needed for Wi-Fi, not just a switch
Confusing a router (connects networks) with a switch (connects devices within a LAN)
Not mentioning interference as a disadvantage of wireless

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Worksheet — 4.1c Wired & Wireless Networks

8 Edexcel-style questions · AI-marked

Q1State two advantages of a wired network over a wireless network.[2]

✅ Mark scheme

Any two from: faster/more reliable speeds [1]; more secure as signals cannot be intercepted [1]; not affected by interference [1]; more stable connection [1].

Q2State two disadvantages of a wireless network.[2]

✅ Mark scheme

Any two from: less secure — signals can be intercepted [1]; susceptible to interference from other wireless devices, walls, or appliances [1]; limited range — signal weakens with distance [1]; can be slower than wired connections [1].

Q3Explain the function of a router in a network.[2]

✅ Mark scheme

A router connects different networks together [1]; for example connecting a home/office LAN to the internet, and assigns IP addresses to devices on the network [1].

Q4What is a Wireless Access Point (WAP) and what does it do?[2]

✅ Mark scheme

A WAP is a hardware device that transmits wireless signals (Wi-Fi) [1]; allowing wireless devices to connect to a wired network [1].

Q5Why is a wired network considered more secure than a wireless network?[2]

✅ Mark scheme

In a wired network, physical access to the cable is required to intercept data [1]; in wireless, signals travel through the air and can be intercepted by anyone within range without physical access [1].

Q6Explain the difference between a switch and a router.[2]

✅ Mark scheme

A switch connects devices within a single LAN, sending data to the correct device using MAC addresses [1]; a router connects different networks together, e.g. a LAN to the internet [1].

Q7A business is setting up a new office. Give one reason why they might choose a wired network and one reason they might choose a wireless network.[2]

✅ Mark scheme

Wired: more secure, faster speeds, more reliable for business-critical work [1]; Wireless: easier to set up, allows staff to move around with laptops/tablets, cheaper installation as no cables needed [1].

Q8What is the difference between twisted-pair copper cable and fibre optic cable?[2]

✅ Mark scheme

Twisted-pair copper uses electrical signals, is cheaper and widely used for Ethernet connections [1]; fibre optic uses light signals, is much faster and can carry data over longer distances but is more expensive [1].

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Term	Definition

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Wired vs Wireless Networks

Wired Networks

Wireless Networks

Wired vs Wireless Comparison

Network Hardware

Worksheet — 4.1c Wired & Wireless Networks

Mini Test — Wired & Wireless Networks