الفهرس 
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Abstract
Software Defined Networking (SDN) is a software-based solution which setup a unified control plane, as an intelligent network manager, to control the whole network devices that only forward data, instead of controlling each device alone which wastes time and effort. The conversion from the traditional networks to the SDN network has significant challenges that need a deep consideration regarding to reliability and scalability issues. The main core of SDN is the controller which participate and dominate in all logics and decision making. This big rule for controller has multiple issues should be clarified and fixed due to its centralization which affects negatively the Reliability and scalability during the heavy-duty tasks in SDN.
This thesis focuses on finding a network architecture enhance Reliability and Scalability issues through Multiple Domains with multiple controllers and Failover “MDCF” to eliminate the problem by dividing network Devices to multiple domains. Each domain is supervised by controller with failover controller.
This model made SDN more robust by improving the Reliability and Scalability in SDN by increasing the availability and decreasing the delay and lost packets.