Description
Explain OSI Model? Describe the tasks performed by Each Layer and the Protocols Used on each layer.
Please write this assignment with you own understanding, Do not copy from internet. At least 4 pages.
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Explanation & Answer
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Running head: OSI MODEL
Open Systems Interconnection model (OSI Model)
Student’s Name
Course title
Date: 15 July 2017
1
OSI Model
OSI MODEL OVERVEW
Open Systems Interconnection model (OSI) is a model of networking that layer the functioning
of network into different layer, more specifically into seven layer. The seven layer include
physical layer, datalink layer, network layer, transport layer, session, and presentation and
application layer. OSI model specify how the layers communicate and how they interface and
also the protocol suite among each of the layer. Notably OSI Model is not a technology,
protocol, program or software but a way of describing how network work. (Mitchell, 2017)
Figure 1 OSI model
Data flow in the model
Data flow within the Model start with top layer, where sending of data usually occur, and then the
data flow down the stack to the lowest layer. OSI Model is a point of reference when describing
and learning networking concept. The following discussion outline and explore deeper into the
OSI Model
OSI concepts .The function and protocol suite in each layer are also outlined below.(Mitchell,
2017)
Physical layer
This is the lowest or the bottom layer in the OSI MODEL stack layer. The main function of the
physical layer is transmission and reception of the unstructured raw bits or signals using physical
medium such as wires and cables. More specifically physical layer in OSI Model defines the
electrical and the physical specification of the data connection between different mediums. That
is the description of electrical, mechanical and functional interfaces of any physical medium and
thus be able to carry the signals to other layers. The following listing shows the function of the
layer. (InetDaemon, 2014)
i.
Data encoding – This is a function of physical layer that enable modification of the
simple digital signal which are used by the computers thus enabling accommodation of
more physical characteristics of the physical medium.
ii.
The Transmission technique – this determines the characteristics of the bits will be
transmitted by medium of signaling.
Physical layer is never concerned with any protocol as the other higher layer does. But is
determine the network topology such as Star, Bus and others. Hardware in this include
modems, fiber converters, adapters, repeaters and also network hubs.
DATA LINK LAYER
This layer is...