Data Link Layer, Transport Layer, Cloud Computing and Network

IT write up

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Table of Contents
Topic 1: Data Link Layer......................................................................................................................2
Topic 2: Transport Layer.......................................................................................................................4
Topic 3-Cloud computing and network.................................................................................................7
References...........................................................................................................................................10

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Topic 1: Data Link Layer
The data link layer is used for coding and decoding the bits of data. In this the data packets
are framed and addressed into layers. The sub layer of data link layer is MAC layer. The
MAC layer allows the data to be transmitted in a best way. The data link layer is used for
communicating with devices that are present on the same network. It can be said as an
interface between physical and network layer (Xu, Li, Li, Zhang & Muntean, 2015). It is the
second layer of OSI model and the main functions of this layer is to transfer the data to
network layer ad regulate the data flow. They also deal with the transmission error by
making sure that information is transferred by encoding the data (Armstrong, et. al, 2015).
Data link layer assures that every piece of information is secured and then it is transferred to
desired location.
(Source: https://www.studytonight.com/computer-networks/osi-model-datalink-layer)
It is a most reliable node to node delivery of data as in this packet is received from network
layer and it is transferred to physical layer. The data is transferred in encoded form so that
only authorised user can access the information. The network layer is not able to detect the
transmission error that is done by the data link layer (Xu, Li, Li, Zhang & Muntean, 2015).
This is done by breaking the message into small packets and then transferring the data into

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frames and that too sequentially (Lopacinski, Nolte, Buechner, Brzozowski & Kraemer,
2015). The receiver’s future confirms the data packet received by sending the
acknowledgment frame. Some of the basic functions that are carried by data link layer are:
(Source: http://ecomputernotes.com/computernetworkingnotes/communication-networks/
which-are-the-sub-layers-in-data-link-layer)
 Framing- In this the data is divided into bits of information and that is it transferred to
next layer (Lopacinski, Nolte, Buechner, Brzozowski & Kraemer, 2015).
 Physical addressing- The header is added to the frae of data that contains the physical
address of the sender.
 Access Control- This layer also defines the control that need to be given to two or
more devices that might be connected to the same link (Olivieri, Cristini, Monteduro,
Pariscenti, Calabretta, Dell'Oro & Murru, 2016).
 Error Control- The error is also controlled by adding a trailer at the end of the frame.
It is added to remove the duplicate packets.