$1.$ What is layering?

$2.$ Why is layering useful in organizations?

$3.$ Why is layering useful in computer networking?

$4.$ What are the five layers of the TCP$/$IP model?

$5.$ What are the primary functions of each layer in the TCP$/$IP model?

$6.$ What are the primary responsibilities of TCP$?$

$7.$ What devices does a packet typically encounter in its journey from source to destination?

$8.$ What is the OSI model?

$9.$ What was the motivation for the development of the OSI model?

$10.$ How has the OSI model been useful in the development of computer networks?

$11.$ What are the seven layers of the OSI model?

$12.$ What are the primary functions of each of the seven layers of the OSI model?

$13.$ What are the two design principles behind Internet protocols?