Modeling and Simulation of Data Center Networks

Cloud computing is projected as the major paradigm shift in the Information and Communication Technology (ICT) sector [1]. In recent years, cloud market has ex-perience enormous growth and adoption. The cloud adoption is expected to increase in coming years. As reported by Gartner [2], Software as a Service (SaaS) market is expected to rise to $ 32.3 billion in 2016 ( $ 13.4 billion in 2011). Similarly, Platform as a Service (PaaS) and Infrastructure as a Service (IaaS) are projected to rise from $ 7.6 billion in 2011 to $ 35.5 billion in 2016. Cloud computing has been adopted in almost all of the major sectors, such as business, research, health, agriculture, e-commerce, and social life. A data center is a repository to hold computation and storage resources inter-connected to each other using network and communication infrastructure [3]. Data centers constitute the foundations and building blocks of cloud computing. Con-tinuous evolution of cloud services, as well as their increased demand mandate growth in data center resources to deliver the expected services and required Quality of Service (QoS). Various cloud service providers already host hundreds of thou-sands of servers in their respective data centers. Google is estimated to host aroun