Network Models: Week3
Network Models: Week3
Network Models: Week3
Week 3
Objectives
Upon completion of this module, the students should be able to:
•Differentiate Protocol Model and a Reference Model
•Define the TCP/IP Model and The OSI Model
•Discuss the function of the Layers of the OSI Model and TCP/IP Model
•Compare the OSI Model with the TCP/IP Model
Protocol and Reference Models
Protocol model
•This provides a model that is closely equivalent to the
structure of a certain protocol.
Reference model
•This provides a common reference for maintaining
consistency within all types of network protocols and
services.
Network Models
Network Models Defined
•A Network Model is a set of network layers and how they
interact.
•The following are the two most important and well-known
network models:
•OSI Model (Open Systems Interconnect)
•TCP/IP Model (Transmission Control Protocol/Internet
Protocol)
OSI Model
Layers of the OSI Model
Function of the OSI Model Layers
Application Layer (Layer 7)
•Application layer is the topmost layer of the OSI Model. This
layer provides a means for the user to interact with the software
application
Presentation Layer (Layer 6)
•This layer provides proper common data format that is sent
across Application Layer services.
Session Layer (Layer 5)
•This layer establishes, manages and terminates connections
between applications. This layer provides services to the
presentation layer.
Function of the OSI Model Layers
Transport Layer (Layer 4)
•This layer defines services to segment, transfer, and
reassemble data individual communications between the end-
devices.