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Today’s computer networks experience a momentum toward a modern era. There must be some modifications in their servicing form, the network bandwidth and network delay should be increased and minimized respectively to achieve more effective performance. SDNs compared with current networks are less costly and more flexible. In SDN, the control unit is separated from data flow. Increasing reliability and accessibility are among most important SDN’s challenges. In this survey various reliability forms in software have been reviewed, subsequently a SDN architecture model has been studied containing 6 hosts and a storage. The results have shown that with increase in links’ number among hosts, higher the network reliability is.
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