Question

1. What are the functions of the application layer? How were the earliest application-layer protocols defined? What application do you spend the most time on?

Answer 1

Answer:

The function of the application layer: The main function of the application layer is to hide details of Transmossion Control Protocol and Internet Protocol from end user applications.

Earliest protocols were FTP, SMTP, Telnet.

The application I likely spend most time on is HTTP.

Explanation:

See answer