ISA Server supports both distributed and hierarchical caching. In distributed caching, the ISA Server cache is distributed among array members. In hierarchical caching, different ISA Servers or arrays can connect to other ISA Servers or arrays for cached data access, or eventual access to the Internet. The array closest to the Internet is considered the "upstream" array while the array that is most far from the Internet is considered the "downstream" array. Aside from caching, a chained configuration can provide authentication functions as well.
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