An MSMQ site is considered to be fully connected if it is possible to route messages, either directly or using MSMQ servers (PEC, PSCs, BSCs, or MSMQ routing servers), between every computer in the site, without having to go to another site. For example, a site does not have full connectivity if it has two CNs, and the only computer that connects the two CNs is an MSMQ independent client.
An MSMQ enterprise is considered to be fully connected if sites are fully connected.