What are the basic criteria for selecting P2P Networking?

When selecting a peer-to-peer (P2P) networking solution, consider scalability, as the system should efficiently handle an increasing number of nodes. Security is also crucial; the network must ensure data integrity and privacy among peers. Additionally, assess the ease of implementation and maintenance, as well as the network's performance in terms of speed and reliability. Lastly, evaluate the compatibility with existing systems and protocols to ensure seamless integration.