Wireless Networks | 3.2 | OCR GCSE Computer Science | J277

14 flashcards

How do wireless networks transmit data?: Radio waves transmit data through the air.
What are the 2 most common modes of wireless connection?: Wi-fi and Bluetooth.
How does Wi-fi work?: It is used with Wireless Access Points to connect wireless devices to a network (e.g. the Internet).
Why is Wi-fi better than Bluetooth in terms of speed and range?: It can transfer data faster and across a longer range.
What is the range of Bluetooth: Usually less than 10 metrers.
What does Bluetooth require for a wireless connection?: For 2 devices to be paired. It is suitable for 'ad hoc' (temporary) connections.
Advantage of wireless networks (movement): Wireless networks allow users to move freely within the coverage area without being restricted by cables.
Advantage of wireless networks (set up): Easy to set up and connect devices, even outdoors.
Advantage of wireless networks (scalability): Very scalable as more devices can be connected without the disruption of cables.
Advantage of wireless networks (accessibility): Some devices (e.g. phones) cannot be physically connected to a network, so a wireless connection is needed.
Disadvantage of wireless networks (speed): Slower data transfer speeds than wired connections, with higher latency.
Disadvantage of wireless networks - Why are wireless networks less secure than wired networks?: Wireless signals are much easier to intercept than wired ones.
Disadvantage of wireless networks (interference): More likely to suffer interference from physical objects, e.g. walls, which will lower the performance.
Disadvantage of wireless networks (area): Limited coverage area, with decreasing signal strength the further you move from the WAP.