Mobile Ad Hoc Network (MANET) is collection of multihop wireless mobile nodes that Communicate with each other without centralized control or established infrastructure. The wireless links in this network are highly error prone and can go down frequently due to mobility of nodes, interference and less infrastructure. Therefore, routing in MANET is a critical task due to highly dynamic environment. This research paper provides an overview of these protocols by presenting their advantages and disadvantages of the proactive, reactive and hierarchical protocols and then makes their comparative analysis of their advantages and disadvantages. The clustering technique is effective in prolonging the lifetime of the network.The simulation result demonstrates that dual cluster heads in distributed hash table replication can improve the performances of a replica manager with respect to updates propagation in comparison to that of a single cluster head in distributed hash table replication system. Therefore objective is to make observations about how the advantages and disadvantages of these protocols can be improved.However, remains a challenging problemwe have proposed Dual cluster heads within a single cluster replication and we increase the node energy lifetime.