$1.$ What is the primary responsibility of the physical layer in data communication?

$2.$ Define physical medium in the context of computer networking.

$3.$ What properties are required for a material to be suitable for use as a physical medium in computer networks?

$4.$ What is UTP?

$5.$ Why is the copper cable commonly used in computer networks called UTP?

$6.$ Describe the copper cable categories and relate these to conditions for use.

$7.$ What factors favor the use of optical fiber as a physical medium over copper?

$8.$ How does total internal reflection help optical fiber transmit light signals efficiently?

$9.$ Under what conditions is each of the two categories of fiber optic cable preferred?

$10.$ What is the role of each of optical fiber component?

$11.$ What are the common physical media used in computer networks?