cslabs.montana.edu       csstuff.montana.edu
      O     O     O     O      O     O     O     O
      |     |     |     |      |     |     |     |
     --------------------      --------------------


                        |---|
                        |   |  dns.cs.montana.edu 
                        |---|  (caching only for cslabs, csstuff and cs)

 
       coe.montana.edu           ce.montana.edu
      O     O     O     O      O     O     O     O
      |     |     |     |      |     |     |     |
     --------------------      --------------------

                        |---|
                        |   |  dns.coe.montana.edu 
                        |---|  (primary for cslabs, csstuff, cs, ce, coe, ...
                                and secondary for math.montana.edu)


                        |---|
                        |   |  dns.montana.edu 
                        |---|  (primary for all montana.edu subdomains
                                except those that are in coe)
                                and secondary for math.montana.edu)