2 Communication

Which statements are correct?

1 Wireless transmission media doesn't require a physical cable

2 Wireless signals are sent through the air

3 Wireless signals can travel through walls

• 1 and 2

• 2 and 3

• 1 and 3

• 1, 2, and 3

Twisted pair cables is often used in

• LANs

• MANs

Which cable type is most often used in MANs?

• Twisted pair cables

• Coaxial cables

• Fibre optic cables

WiFi and Bluetooth use _______________ _________ as the carrier of data transmission.

(a)  

Which option best describes how Bluetooth sends and receives radio waves?

• Each device is assigned one of 79 possible IDs, devices with the same ID will be able to connect to each other

• Each device uses one of 79 frequency channels to connect to another device

• Each device uses a frequency from 0-79 GHz to connect to another device

• Each device uses one of 79 Bluetooth-specific protocols to connect to another device

A method of transmitting radio signals in which a device picks one of 79 channels at random. If the chosen channel is already in use, it randomly chooses another channel.

(a)  

Select all types of electromagnetic radiation

• infrared

• radio

• microwave

• ultraviolet

Which options best describes how WiFi represents data.

• Changes in radio frequency signify 0 and 1

• Changes in radio's wave amplitude signify 0 and 1

• Changes in types of radiation signify 0 and 1

• Changes in radio direction signify 0 and 1

Which has faster data transfer rate?

• Bluetooth

• WiFi

Which is more limited in range?

• Bluetooth

• WiFi