The preference list provides each Cache Manager with a list of known connections to various File Servers and FL Servers. This allows the Cache Manager to select alternative connections to communicate with the appropriate servers should a network or server fault make a particular connection unavailable. Similarly, each File Server or FL Server that has multiple connections to the network should have multiple default entries in its routing table that define the various routers available to that server. Thus, if a network fault makes a particular router unavailable, that server has additional router choices that would allow it to reply to Cache Manager requests. Refer to your operating system documentation for information concerning adding default entries to a server's routing table.