Does the discovery protocol limit Jini within a single subnet?
• a multicast request protocol • a multicast announcement protocol • a unicast discovery protocol When a service provider or client finds itself connected to a new and unfamiliar network, it sends out a presence announcement on a well-known multicast port. This is the multicast request protocol. Lookup services monitor this well-known port. When a lookup service receives a presence announcement, it inspects the packet and decides whether or not to contact the sender. If it decides to make contact, it establishes a direct unicast connection to a host and port included in the presence announcement. The service provider or client sends a ping across this direct connection, and the lookup service responds with a service registrar object. The ping/service registrar conversation is the unicast discovery protocol. Lookup services may also periodically send a presence announcement to a well-known multicast port, which clients and service providers can monitor. This is the multicast announcemen
