book
Business Data Communications and Networking, Eleventh Edition
by Jerry Fitzgerald, Alan Dennis, Alexandra Durcikova
August 2011
Intermediate to advanced
592 pages
20h 28m
English
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CHAPTER 2
APPLICATION LAYER

THE APPLICATION layer (also called layer 5) is the software that enables the user to perform useful work. The software at the application layer is the reason for having the network because it is this software that provides the business value. This chapter examines the three fundamental types of application architectures used at the application layer (host-based, client-based, client-server). It then looks at the Internet and the primary software application packages it enables: the Web, email, Telnet, and instant messaging.
OBJECTIVES ![]()
- Understand host-based, client-based, and client-server application architectures
- Understand how the Web works
- Understand how email works
- Be aware of how Telnet and instant messaging works
CHAPTER OUTLINE ![]()
2.2.1 Host-Based Architectures
2.2.2 Client-Based Architectures
2.2.3 Client-Server Architectures