Before revision:  We identify optimal content placement strategies in a particular scenario of limited content catalogue , casting the problem into the framework of loss networks .
After revision:  We distinguish two scenarios, namely "Distributed Server Networks" (DSN) for which requests are exogenous to the system, and "Pure P2P Networks" (PP2PN) for which requests emanate from the peers themselves. For both scenarios, we consider a loss network model of performance, and determine asymptotically optimal content placement strategies in a particular scenario of limited content catalogue , casting the problem into the framework of loss networks .