Setup has the ability to switch servers during an installation to maintain maximum throughput or recover from a distribution site that is not responding. Switching servers occurs when Setup detects no throughput or less than one byte in two minutes.
If a connection times out, Setup will try to connect to the next download site in the list and continue the setup process at the beginning of the partially downloaded .cab file. If a connection times out and Setup does not switch servers, it will attempt to reconnect to the download site and continue the setup process at the point where it left off. If a connection to the download site cannot be established, Setup asks if you want to abort the installation or try again.