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The operational and capital costs of diverse proprietary network appliances are increasing day by day. It is causing problems of network ossification for service providers. Service providers are under pressure to offer these network services while keeping operational and capital costs to the minimum. Network function virtualisation (NFV) is an open standard and non-proprietary based model that is witnessing significant development in replacing current vendor-specific and closed source implementations. NFV technology allows service providers to implement the software version of the middlebox on the commercial-off-the-shelf (COTS) server, called virtual network function (VNF). Software-defined networking (SDN) is another promising technology used to make the network flexible and programmable. When employed in conjunction with the SDN, NFV offers agile traffic steering, dynamic monitoring of VNFs, and …