Quality of Service of Public Cloud Computing

Key Factors to Find Out the Quality of Service of Public Cloud Computing


Cloud computing is Internet-based computing where shared resources, software and information are provided to the computers and other devices on demand, like the electricity grid. This type of computing differs from traditional computing because not all the resources are performed by the private corporations. They are shared by many organizations and used by many people. Cloud computing is providing service of several companies, which is not owned by any individual.

Cloud Computing Models

The models of cloud computing are ever evolving, but the most important factors to consider are:


The provision and demand of the computing needs is determined by the physical infrastructure. Physical components include memory, storage, servers and other network appliances. Private and public clouds are two different clouds with slight differences.

Built-in Services

In public cloud model, the service platform is owned by the service provider which handles both the processes and users of the technology. This capability confers several benefits like no or low capital expenditure, easy accessibility of technology updates and technology stacks, and no or low operating cost.

In built-in services, the service provider provides and manages important resources and services like storage, databases, web servers and other internal compute resources.

The best type of cloud computing is the hybrid model. It is combination of both public and private clouds. It provides a public cloud for applications and data storage and a private cloud for each user.

Cloud Computing is a technology that uses the remote service from either the central or the remote service provider.

These services are divided into three classes:

Classification of Service

The first element of cloud computing is the compartmentalization of the service. The term is used to indicate that the service is separated into different components depending on their need. The different components are storage, processing, and network; and the user gets onto the service from a set of applications.

The different models of the service provide different affordances. The different models can be summarized as follows:

Remote Services

Services are available from a centralized location. An organization’s applications or data are hosted on this platform. It often needs the services for productivity purposes, e.g. for using databases, calendars, etc. Computers located on the local area network are connected to the services through a high speed cable to perform-work processes are executed on the central server.

The remote services are often implemented through browser based applications, or applets. An application offering similar services to those of Microsoft’s Small Business Server is installed on the machine. Each computer attempting to connect to the service is identified, and the applications which are offered are given priority.

Cloud Computing Models

There are three basic models of cloud computing:

With the centralization of computing becoming a reality, and with the exponential growth of peripherals, the need to safeguard data from loss due to hardware failure is increasing. Cloud computing has the potential to provide solutions to several business problems simultaneously, and is being put to use in organizations around the globe.


A spline based on the graph ofspanning instead of a single lineal approach. It reduces the critical span of data movement to the extent that entire careers and/or businesses can be saved due to data Spanning.


The services are distributed to a number of servers and client computers at different locations.


In this model, the client computers demand a ‘Single point of lights’. The computers demand a ‘Client request only’ type of service.

There are 3 variations of client machines:

unk satellite

A satellite is a ‘client’ machine. A video signal is sent from a centralized location to the client. The bandwidth can be shared among the network. This technology is commonly used to connect a PC network to the World Wide Web.


Inbuilt machines use a central processor to send and receive data, so that a few computers can use the network. This model is rather expensive since each computer requires a relatively fast central processing unit.


This model has been in use since the early 1980s, and allows thousands of computers to use the network simultaneously. The computers can be connected to the server over any distance, and the load is spread evenly across the network. This configuration is more common in LANs than in WANs.


borg networks are used for connectivity between two or more computers that are in different locations and that have fairly low distances between them. A bborg network uses a number of computers that are linked together in a local area network (LAN) setting.

Spanning Tree Protocol (STP) is a link-state protocol, and its main strength is that it can use multiple paths to reach a destination. This ability to spread the work load reduces the consumption of network bandwidth.


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