|  | 15.3 | Network Applications
| 15.3.1 | Internet applications

You select network applications based on the type of work you need to accomplish. A complete set of application layer programs is available to interface with the Internet. Each application program type is associated with its own application protocol. Although there are more programs and protocol types available, the following are the main focus of this chapter:

- The World Wide Web uses the HTTP protocol.
- Remote access programs use the Telnet protocol for directly connecting to remote resources.
- E-mail programs support the POP3 application layer protocol for electronic mail.
- File utility programs use the FTP protocol for copying and moving files between remote sites.
- Network data gathering and monitoring use the SNMP protocol.

It is important to re-emphasize the fact that the application layer is just another protocol layer in the OSI or TCP/IP models. The programs interface with application layer protocols.

E-mail client applications (i.e. Eudora, Microsoft Mail, Pegasus, and Netscape Mail) work with the POP3 protocol. The same is true with Web browsers. The two most popular Web browsers are Microsoft Internet Explorer and Netscape Communicator. The appearance and operation of these two programs is very different, but they both work with the application layer HTTP protocol.