Quote from: RoadTrain on September 17, 2015, 04:45:50 PM

Quote from: RoadTrain on September 17, 2015, 07:30:07 AM

Quote from: knight22 on September 17, 2015, 01:47:34 AM

Sorry I should add this precision: Broadcasting a transaction to a node that has already received this transaction.

In other word, inefficiencies.

I'm not sure what you are talking about. Do you mean that if a node sees a new transaction or block, it immediately relays it to other peers?
As far as I'm aware that's not quite true. The only thing a node does when receiving new tx/block is send an inv message containing its hash. After that, a peer can request a tx/block using a getdata message if it doesn't already have it.

A node receives tx only when it asks for it.

yes node magically know when other nodes transact