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Unformatted text preview: an access a wide variety of contents and
and also allows application developers to build content services and
that can run on a large base of mobile devices.
WAP Layers Protocols company or
applications Functions Application
Application Provides an application environment required for
the development and execution of the
applications, that is, micro browser environment,
WML, and WML script.
Session Layer Wireless
Session Supplies methods for the exchange of
information between client and server
application. These methods include HTTP
functions and semantics, facility for reliable and
unreliable data push, and protocol feature
Transaction Provides several types of transaction services.
Security Layer Wireless Transport Layer Provides authentication, privacy, and secure
connection between applications.
Transport Layer Wireless
Datagram Provides a common interface to upper layer
protocols by adapting to specific features of the
Wireless Layer Wireless and mobile Provides a specific way to transmit information
over a wireless link.
Figure 17.26. The various WAP layers, the protocols at each layer, and their
DISTRIBUTED COMPUTING SYSTEMS
The merging of computer and networking technologies gave birth to distributed
computing systems in the late 1970s. Simply speaking, a distributed computing
system is a collection of computers interconnected by a communication network.
It is a configuration in which many independent computer systems (which may be
geographically far apart) are connected by a communication network, and in
which messages, processing task, programs, data, and other resources are
transmitted between cooperating computer systems. Such an arrangement enables
the sharing of many hardware and software resources as well as information
among several users who may be sitting far away from each other. It also increases
the usability of computers by bringing them closer to the end users and by integrating them into daily business activities at the locations at which these
activities take place. The indiv...
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- Spring '14