P2P,a major problem.

Peer-to-peer networks have many disadvantages:

• this system is not centralised, making administration difficult
• lack of security
• no link in the network is reliable

Therefore, peer-to-peer networks are only useful for a small number of computers (generally about 10), and only suitable for applications that do not require a high level of security (it is not advisable in a business network containing sensitive data).