How to implement a network medium that is not susceptible to EMI. Which type of cabling should you use?

Segmentation of a data stream happens at which layer of the OSI model?

When data is encapsulated, which is the correct order?

Which of the following are unique characteristics of half-duplex Ethernet when compared to full-duplex Ethernet?
1. Half-duplex Ethernet operates in a shared collision domain.
2. Half-duplex Ethernet operates in a private collision domain.
3. Half-duplex Ethernet has higher effective throughput.
4. Half-duplex Ethernet has lower effective throughput.

What type of RJ45 UTP cable is used between switches?