Chapter 15: Layer 7 - The Application Layer Links:

15.1 | Basics of the Application Layer

15.1.1 | Application processes The Application Layer of OSI
15.1.2 | Direct network applications Client/Server Frequently Asked Questions
15.1.3 | Indirect network support Redirectors
15.1.4 | Making and breaking a connection

15.2 | Domain Name System

15.2.1 | Problems with using IP addresses DNS: The Domain Name System
15.2.2 | The domain name server DNS: The Domain Name System

15.3 | Network Applications

15.3.1 | Internet applications
15.3.2 | E-mail message What is Email? Email Basics and Asynchronous Communication
15.3.3 | DNS function

15.4 | Application Layer Examples

15.4.1 | Telnet What is Telnet?
15.4.2 | File transfer protocol
15.4.3 | Hypertext transfer protocol Hypertext Transfer Protocol