Answer Posted / kumar raja

Cognos 8 is 3 tier architecture namely
1) Web server
2) Applications
3) Data

web server :-
Cognos 8 web server contains one or more cognos 8 gateways.
Web communication is possible through gateway.
gate way is an component to be installed and configured.
gateway transfers data from one server to another server.
The different gateways are apache_mod, servlets, CGI etc
Application :-
The cognos 8 Application tier contains one or more cognos 8
servers.
cognos 8 server runs requests sent by the gateway.
Data :-
The cognos 8 data tier contains the content store, data
sources, metric store.

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