Describe the OSI model. In which layer(s) does CDPD operate?
What will be an ideal response?
Application Layer: Provides access to the OSI environment for users; provides
distributed information services.
Presentation Layer: Provides application independence from data representation
(syntax) differences.
Session Layer: Provides the control structure for communication between
applications; manages all aspects of connections (sessions) between cooperating
applications.
Transport Layer: Provides reliable and transparent data transfer between end
points; provides end-to-end error recovery and flow control.
Network Layer: Responsible for establishing, maintaining, and terminating
connections. It provides upper layers independent of data transmission and
switching tasks.
Data Link Layer: Provides reliable data transfer across the physical link; manages
frame synchronization in terms of error control and .own control.
Physical Layer: Manages the movement of the unstructured bit stream over the
physical medium. It handles all aspects of accessing the physical medium. CDPD
operates on Physical Layer and Data Link Layer of the OSI model.
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