Software Defined Networks (SDN) is a new way to build network architecture. It divides networking hardware into a data plane (switches) and a control plane (controllers). HMM, which stands for "Hidden Markov Model," is a new way to handle cluster administration. Because the control plane can be made more scalable, the amount of bandwidth being used is a problem. In software-defined networking (SDN), the Control plane favours a centralised solution in which a single control unit can see the whole network. In large-scale networks, the controls plane is often set up as a cluster of distributed controllers to meet the needs of management and the board. Cluster management technology in SDNs creates a lot of information because it logs and analyses a wide range of events and is needed to give a consistent global view of the health of the network. Cluster management technology is an important part of SDNs because it keeps track of all kinds of events and makes sure the network is always in the same global state. This is why a lot of information is made all the time. Because SDNs can be programmed and change over time, there is still a question about security in the cluster.

Software Defined Networks , secure cluster management , HMM