Abstract: Connectivity of network is the premise to optimize the topology of P2P network. In order to ensure that each node has connected to each other in the P2P network and enhance the survivability of the network topology, an effective distributed method was carried out in the unstructured P2P network which detects the topologically-critical nodes and eliminates them appropriately, it will strengthen the overlay network to defeat the partition and improve the system' s fault tolerance significantly. I}his paper proposed an SCAM topologically-critical nodes discovery algorithm, which improves the CAM The theoretical analysis and simulation results show that, the SCAM reduces the network consumplion and improves the discovery efficiency significantly by maintaining the high accuracy at the same level.

Key words: Pecr-to-Peer overlay network, I}opology optimization, CAM