then sent to client computer 210 stage 370 and operation 350 terminates alternatively a dns error is generated stage 375 and operation 350 terminates as explained above in some embodiments further dns queries recursive or non recursive may be attempted rather than generating the dns error fig4 a and 4b illustrate exemplary configurations of computer system 200 fig2 a 2c in both configurations client computer 210 and server computer sites 220 n are connected to a computer network 230 in the configuration of fig4 a however dns lb server 240 and dns fo server 250 are executed by a single server 260 by contrast in the configuration of fig4 b dns lb 240 is executed by server 270 while dns fo 250 is executed by a separate server 280 several off the shelf products can be used to implement dns lb server 240 and or dns fo server 250 in some embodiments of the invention dns lb server 240 and dns fo server 250 are implemented using the distributeddirector 2500 series available from cisco systems inc of san jose calif in other embodiments dns platforms other than cisco 39 s distributeddirector may be used accordingly the invention is not limited to any particular dns platform in some embodiments each server computer site 220 n may in turn comprise multiple server computers 450 n as shown in fig4 a with respect to server computer site 220 a where server computers 450 n share session state amongst themselves fig4 c illustrates a grouped computer system 400 for distributing load among.