Module 6

Question 1

What transmission medium do cables with metal wires work with?

Answer 1

Data encoded into electrical impulses.

Question 2

What transmission medium do cables with glass or plastic fibers work with?

Answer 2

Data encoded in pulses of light.

Question 3

What transmission medium does wireless transmission work with?

Answer 3

Data encoded to specific frequencies of electromagnetic waves.

Question 4

What are the four main criteria when choosing network media?

Answer 4

amount of data
- the amount of data, and speed, the data must be transmitted
cost
- the cost of the media and installation
distance
- the maximum distance that the media can carry a signal
environment
- the environment the media will be installed

Question 5

What are two internal physical characteristics that describe an Ethernet cable?

Answer 5

• they’re made up of eight twisted copper wires (to reduce crosstalk and EMI (electromagnetic interference!))
• the copper wires are in four pairs and are colour-coded

Some other things:
- they can be grey, blue or black.
- they will always have RJ45 connectors with a cable clip.
- they have double the amount of wires as a phone cable (8 vs 4).
- they can be flat or round.
- they can be cut to whatever length you need.