Abstract : We propose to dramatically improve the reliability, fault tolerance, and survivability of wide area networks by systematically rethinking network design using the principle that the operation of network protocols should be enforceable - the correct operation of a protocol should not depend on trust. We propose to rethink four areas of network protocol design: the information exchange at the interface between nodes, the transient behavior of protocols under failure, the placement of enforcement functionality at the edges or inside the network, and the detailed control over resource allocation inside of routers. We will deliver a suite of network protocols - for routing, transport, multicast, and real -time - which have enforceable behavior without trust.