Big Concepts

Question 1

802.11 standard

Answer 1

Is now called wifi. Wifi was released in 1997.

The committee was called 802.11.

Question 2

Radio Frequencies

Answer 2

Electromagnetic waves.

Very low to ultra high frequencies.

Question 3

Radio wave

Answer 3

Invisible field made up of both a magnetic and electric field.

They both support and regenerate one another. Mutually supportive.

Question 4

Polarisation

Answer 4

Polarisation of a radio wave means how it is orientated to the surface of the earth.

Vertical and horizontal.

Transmit and receive antennas should be polarised in the same way for effective communication.

Question 5

Amplitude

Answer 5

Strength of a radio wave.

Watts or decibels.

Question 6

Frequency

Answer 6

Number of times per second that the signal repeats itself.

Hertz.

Question 7

Phase

Answer 7

How far the signal is offset from a reference point.

Time or signal.

Question 8

MAC Address

Answer 8

media access control

numerical label assigned to each piece of network interface controllers (NICs)

12 characters (48bits)

hexadecimal format

6 bytes

First 6 digits: organisationally unique identifier (OUI)
Last 6 digits: serial number of the device