Which type of wave is used to carry data in a wireless network?
Radio waves
What is the main purpose of a wireless access point?
To connect wireless devices to a wired network
A laptop gets a strong Wi-Fi signal in one room but a weak signal in a room behind a thick stone wall. What best explains this?
Radio waves are blocked or absorbed by solid walls
A player notices a delay between pressing a button and the action appearing on screen while playing online over Wi-Fi. Which characteristic of the connection causes this?
High latency
Several people stream films at the same time on one home Wi-Fi and the picture quality drops. What is the cause?
There is not enough bandwidth
Which is a performance advantage of a wired connection compared with a wireless connection?
It is less affected by interference from other devices
A laptop's Wi-Fi signal always drops when a microwave oven in the next room is switched on. What is this an example of?
Interference
What is meant by latency?
The delay between sending data and receiving a response
What is meant by bandwidth?
The maximum amount of data that can be transmitted over a connection in a given time
Which term describes a wireless technology that lets two devices link directly to each other over a short range of about 10 metres, for example a phone and a pair of wireless headphones?
Bluetooth
What is meant by Zigbee?
A low power wireless technology used for home automation that forms a mesh network
What is meant by NFC?
A wireless technology that works only over a few centimetres and is used for contactless payments and travel cards
A customer pays by holding a phone against a card reader for a moment. Which wireless technology does the phone use?
NFC
Sensors in a smart heating system send a few bytes of data each minute and must run for years on one battery. Why is Zigbee suitable for this?
It uses very little power and sends data at a low rate
A Bluetooth speaker plays music clearly from a phone in the same room but stops when the phone is taken outside. What explains this?
Bluetooth has a short range, so the signal becomes too weak
A tablet has no socket for a network cable but it can still join the school's Wi-Fi network. Which piece of hardware makes this possible?
A wireless network interface card
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