What does STP stand for?

STP stands for Shielded Twisted Pair.

What does UTP stand for?

UTP stands for Unshielded Twisted Pair.

Which body defines the Ethernet standards?

The Institute of Electrical and Electronics Engineers (IEEE).

What are the properties of multi-mode fibre optics?

Relatively large core diameter; carry multiple modes of light; less expensive than single-mode fibre; can only be used for shorter distances (up to about 250m).

Give the properties of single mode fibre optics.

Small core diameter; carries a single mode of light; relatively expensive; capable of transmitting data over long distances (up to about 5km).