additional section policy

[houguanghua]

Dear all,
 
Would you please tell me which RFC depicts the policy of 'additional section'? and how bind server deals with 'additional section'? 
 
Sometimes the number of 'additional section' is more than numbe of  'authority section'. I don't know how local bind server will do when receiving  these additional sections. 
Local Bind server may:
   --
pick one name server randomly
   -- or use sophisticated policies that "score" name servers and pick more often the ones that replied faster


Which is right?
 
Thanks!
Guanghua
 		 	   		  
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