Dynamic Networks Are as Fast as Static Networks (Preliminary Version)

This paper gives an eecient simulation to show that dynamic networks are as fast as static ones up to a constant multiplicative factor. That is, any task can be performed in a dynamic asyn-chronous network essentially as fast as in a static synchronous network. The simulation protocol is based on a new approach, perceiving \local-ity" as the key to fast adaptation to changes in network topology. The heart of our simulation is a new technique, called a dynamic syn-chronizer which achieves \local" simulation of a global \clock" in a dynamic asynchronous network. Using this result we obtain improved solutions to a number of well known problems on dynamic networks. It can also be used to improve the solution to certain static network problems.