What are the primary functions of the data$-$link layer?

$2.$ Why is Ethernet the most popular end$-$user technology at the data$-$link layer?

$3.$ What are the functions of each component of a typical Ethernet?

$4.$ What is broadcast in the context of Ethernet?

$5.$ What are the advantages of broadcasting data in Ethernet?

$6.$ What are the limitations of broadcast as a method of sending data to the intended receiver of communication?

$7.$ What is carrier sensing in Ethernet?

$8.$ What is multiple access?

$9.$ What is a collision, and what is collision detection? How are collisions detected in Ethernet?

$10.$ Describe some techniques you have used in the past to ensure error$-$free communication over the telephone.

$11.$ Provide a layperson$$s overview of CRC$.$

$12.$ Why is CRC preferred over simpler computational techniques?