|  | 15.1 | Basics of the Application Layer
| 15.1.4 | Making and breaking a connection

It is important to note that in each of the previous examples the connection to the server was maintained only long enough to process the transaction. In the Web example, the connection was maintained just long enough to download the current Web page. In the printer example, the connection was maintained just long enough to send the document to the print server. After the processing was completed, the connection was broken and had to be re-established for the next processing request to take place. This is one of the two ways that communication processing takes place. -

Later in this chapter, you will learn about the second method in which communication processing takes place. This is illustrated by the Telnet and FTP examples, which establish a connection to the server, and maintains that connection until all processing has been performed. The client computer terminates the connection when the user determines that he/she has finished. All communication activity falls into one of these two categories. In the next section, you will learn about the Domain Name System, which is supported by the application layer processes.